880 results
Search Results
2. Paper-based colorimetric sensor for detection of chloride anions in water using an epoxy-silver nanocomposite
- Author
-
Franco, Alfredo, Velásquez-Ordoñez, Celso, Ojeda-Martínez, Miguel, Ojeda-Martínez, María, Barrera-Calva, Enrique, and Rentería-Tapia, Víctor
- Published
- 2022
- Full Text
- View/download PDF
3. Synthesis and properties of a new halogen-free flame-retardant epoxy resin flame retardant
- Author
-
Wu, Yushuang, Long, Jiapeng, Liang, Bing, and Yanan, Yan
- Published
- 2024
- Full Text
- View/download PDF
4. Electrochemical impedance characteristics and degradation behaviors of carbon fiber reinforced composite attacked by HF solution
- Author
-
Xu, Huiyi, Gao, Zhiming, Yang, Yang, and Hu, Wenbin
- Published
- 2023
- Full Text
- View/download PDF
5. Synthesis of an efficient phosphorus and triazine ring-containing reactive flame retardant for epoxy resin
- Author
-
Yang, Fan, Wang, Jihui, Wang, Changzeng, Chen, Junlei, and Ding, Anxin
- Published
- 2023
- Full Text
- View/download PDF
6. Development and characterization of epoxy resin composite reinforced with bamboo fiber and bagasse as filler
- Author
-
Sukumar, Nachiappan, Bayeleyegn, Mekonnen, and Aruna, Sampath
- Published
- 2022
- Full Text
- View/download PDF
7. The action of fillers in the enhancement of the tribological performance of epoxy composite coatings
- Author
-
Balázs Jakab, Ileana Panaitescu, and Norbert Gamsjäger
- Subjects
Cover fillers ,Epoxy resin ,Wear resistance ,Polymer tribology ,Paper industry ,Polymers and polymer manufacture ,TP1080-1185 - Abstract
The addition of reinforced material (polymer and mineral fillers) to epoxy resin matrices results in the improvement of the overall performance of the composite, allowing the application of these materials as tribo-materials in industrial applications. Enhancement of the tribological properties (low friction coefficient, increased wear resistance and non-stick properties) of epoxy coatings is done by embedding fillers with various particle sizes and with different filler volume fractions. The aim of this work is to determine the factors influencing the wear-reducing mechanisms of the fillers. This was done by wear tests carried out on a pin-on-disc apparatus and on a Taber Abraser device. A significant decrease in the wear rate was recorded with the formulations containing polymer fillers such as polytetrafluoroethylene (PTFE), polyethylene (PE) and fluorinated ethylene propylene (FEP), due to their self-lubricating nature. The particle size of silica (SiO2) fillers was found to play a significant role, coarse particles reducing the wear rate due to the bond at the resin/filler interface. It was shown that not all fillers helped improving the wear resistance; the SiO2 fillers with lower particle size had a negative effect on the wear resistance of the epoxy coating, by causing discontinuities in the material. The worn surfaces were analyzed using light microscopy and scanning electron microscope (SEM), to help better understand the wear mechanisms involved.
- Published
- 2021
- Full Text
- View/download PDF
8. Cellulose dissolved in ionic liquids as in situ generated filler in epoxy biocomposites with simultaneous curing initiated by ionic liquids
- Author
-
Zielinski, Dawid, Szpecht, Andrea, Maciejewski, Hieronim, and Smiglak, Marcin
- Published
- 2024
- Full Text
- View/download PDF
9. Impact of Silica Sand on Mechanical Properties of Epoxy Resin Composites and Their Application in CFRP–Concrete Bonding.
- Author
-
Babba, Riad, Hebbache, Kamel, Douadi, Abdellah, Boutlikht, Mourad, Hammouche, Redha, Dahmani, Saci, Del Serrone, Giulia, and Moretti, Laura
- Subjects
CARBON fiber-reinforced plastics ,SILICA sand ,REINFORCED concrete ,COMPOSITE materials ,FAILURE mode & effects analysis ,EPOXY resins - Abstract
Premature debonding between carbon fiber-reinforced polymer (CFRP) and concrete is a critical issue in structural reinforcement applications, often leading to a significant reduction in the load-carrying capacity of the system. This failure mode is typically initiated by inadequate adhesion at the interface, compromising the effectiveness of CFRP in enhancing the structural performance of concrete elements. To address these issues, this study explores the impact of silica sand on the mechanical and adhesion properties of epoxy resin composites. Initially, this paper investigates the physical and mechanical properties of epoxy resin composites by varying the ratios of silica sand from 0% to 15% by volume. Subsequently, it examines the effectiveness of these composites as sealing materials to enhance the bond strength between CFRP and concrete. Incorporating a 10% silica content improves the mechanical properties of the epoxy resin, with the tensile strength increasing from 29.47 MPa to 35.52 MPa and an elastic modulus from 4.38 GPa to 5.83 GPa. Furthermore, silica sand enhances the adhesion strength between CFRP and concrete, as confirmed by the increase in the pull-out force from 14.21 kN to 18.79 kN. Silica particles improve surface roughness and interlocking, contributing to a better load distribution and stress transfer at the interface. Therefore, silica-filled epoxy resin is an efficient material for CFRP–concrete bonding applications. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
10. Impact Strength Study of 3D Printed ABS-Plastic Samples Impregnated with Epoxy Resin.
- Author
-
Goncharova, Yu. A., Slavkina, V. E., Kazberov, R. Ya., Sviridov, A. S., and Tuzhilin, S. P.
- Abstract
This paper presents the results of a study of the dependence of the impact strength of impregnated 3D printed samples on the type of used hardener (PEPA and TETA) and the curing mode after impregnation for samples with different directions of plastic laying during the printing process. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
11. Effect of sample cutting angle on mechanical properties of jute/cotton fabric epoxy composite laminates.
- Author
-
Karthik, A., Sampath, P. S., Thirumurugan, V., and Prakash, C.
- Abstract
The usage of jute/cotton natural composites has surged in almost all fields of engineering due to their advantage of possessing high strength to weight ratio and biodegradability. This paper deals with the fabrication and investigation of mechanical properties of jute/cotton fiber reinforced epoxy composite which is relatively a hybrid composite. In this study, the composite is fabricated by a hand layup process followed by compression molding method with varying the number of layers of composite laminates also with different cutting angles. The composites are prepared with four different proportions of jute/cotton fibers. Various mechanical tests are conducted and the result shows that the 14-layer jute/cotton composite has optimum properties achieved and also observed that 90° has better properties than the others cutting angles. Statistical analysis of composites was done by ANOVA-table; based on mean effective plots, the optimum levels of parameters have been identified, and significant contribution of parameters is determined by analysis of variance Also, failure morphology analysis is done using a scanning electron microscope (SEM) through which the internal structures of the tested specimen are analyzed. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
12. The Impact of ZnO Nanofillers on the Mechanical and Anti-Corrosion Performances of Epoxy Composites.
- Author
-
Şomoghi, Raluca, Semenescu, Augustin, Pasăre, Vili, Chivu, Oana Roxana, Nițoi, Dan Florin, Marcu, Dragoş Florin, and Florea, Bogdan
- Subjects
ELECTRONIC materials ,ADHESIVES industry ,CHEMICAL industry ,CORROSION resistance ,ZINC oxide ,EPOXY resins - Abstract
Epoxy resins were reinforced with different ZnO nanofillers (commercial ZnO nanoparticles (ZnO NPs), recycled ZnO and functionalized ZnO NPs) in order to obtain ZnO–epoxy composites with suitable mechanical properties, high adhesion strength, and good resistance to corrosion. The final properties of ZnO–epoxy composites depend on several factors, such as the type and contents of nanofillers, the epoxy resin type, curing agent, and preparation methods. This paper aims to review the preparation methods, mechanical and anti-corrosion performance, and applications of ZnO–epoxy composites. The epoxy–ZnO composites are demonstrated to be valuable materials for a wide range of applications, including the development of anti-corrosion and UV-protective coatings, for adhesives and the chemical industry, or for use in building materials or electronics. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
13. Behavior of Composites Made of Quadriaxial Glass Fiber Fabrics and Epoxy Resin under Three-Point Bending.
- Author
-
Chiracu, Ioana Gabriela, Ojoc, George Ghiocel, Cristea, George Cătălin, Boțan, Mihail, Cantaragiu Ceoromila, Alina, Pîrvu, Cătălin, Vasiliu, Alexandru Viorel, and Deleanu, Lorena
- Subjects
EPOXY resins ,YOUNG'S modulus ,MATERIALS testing ,FLEXURAL modulus ,BEND testing - Abstract
This paper presents experimental results from three-point bending tests for a composite made of quadriaxial glass fiber fabrics and an epoxy resin. Two composites were tested, one with 8 layers and the other with 16 layers; both had the same matrix (the epoxy resin). Tests were carried out, using five different test rates from 10 mm/min to 1000 mm/min. The following parameters were recorded and calculated: Young's modulus, flexural stress, flexural strain, energy, force, and all four for the first peak. The experimental data reveal no sensitivity for these materials based on the test rates, at least for the analyzed range; but, the characteristics for the thicker composite, with 16 layers of fabric, are slightly lower than those for the thinner composite, with 8 layers. The results pointed out that, for the same thickness of composite, certain characteristics, such as stress at the first peak, the flexural modulus, strain at the first peak, and energy at the first peak, are not sensitive to the test rate in the range 10–1000 mm/min. The energy at the first peak is double for the 16-layer composite compared to the 8-layer composite, but the specific energy (as energy on cross-sectional area) has close values: 103.47 kJ/m
2 for the 8-layer composite and 106.51 kJ/m2 for the 16-layer composite. The results recommend this composite for applications in components with resistance to bending or for low-velocity impact protection. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
14. A Rigid–Flexible and Multi-Siloxane Bridge Strategy for Toughening Epoxy Resin with Promising Flame Retardancy, Mechanical, and Dielectric Properties.
- Author
-
Li, Dingsi, Lin, Shufeng, Hao, Jiahui, He, Baohan, Zhang, Huagui, and Chen, Mingfeng
- Subjects
FIREPROOFING ,DIELECTRIC properties ,EPOXY resins ,HEAT release rates ,FIREPROOFING agents ,PERMITTIVITY ,FLAMMABILITY - Abstract
Developing highly efficient and multifunctional epoxy resins (EPs) that overcome the shortcomings of flammability and brittleness is crucial for pursuing sustainable and safe application but remains a huge challenge. In this paper, a novel biomass-containing intumescent flame retardant containing a rigid–flexible and multi-siloxane bridge structure (DPB) was synthesized using siloxane; 9,10-dihydro-9-oxa-10-phosphaphenanthrene 10-oxide (DOPO); and biomass vanillin. DPB could facilitate the formation of a carbon residual with an intumescent structure, which effectively blocked the propagation of heat and oxygen. As a result, the peak heat release rate (pHRR) and total heat release (THR) of DPB/EP-7.5 decreased by 38.8% and 45.0%, respectively. In terms of mechanical properties, the tensile and flexural elongations at break of DPB/EP-7.5 increased by 77.2% and 105.3%, respectively. Impressively, DPB/EP-7.5 had excellent dielectric properties, with a dielectric constant of 2.5–2.9. This was due to the Si-O bonds (multi-siloxane bridges) contained in DPB/EP, which can quench the polarization behavior of the hydroxyl group. This paper provides a facile strategy for the preparation of multifunctional EP, which will pave the way for the promotion and application of EP in the high-end field. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
15. 高寒高海拔地区水工混凝土表面环氧树脂涂层的 耐老化性能提升方法研究进展.
- Author
-
王金凯, 冯菁, 肖承京, 李珍, and 雷进生
- Abstract
Copyright of Coatings & Protection / Tuceng yu Fanghu is the property of Coating & Protection Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2024
- Full Text
- View/download PDF
16. 非共价改性石墨烯的制备及环氧树脂复合材料导热性能.
- Author
-
董育民, 姜昀良, 熊 勇, 周建萍, 胡智为, and 梁红波
- Abstract
Copyright of Polymer Materials Science & Engineering is the property of Sichuan University, Polymer Research Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2024
- Full Text
- View/download PDF
17. DOPS/TPT 复配阻燃环氧树脂的性能.
- Author
-
许松江, 祁钰昭, 胥 秋, 宦宣英, 宝冬梅, 张道海, 秦舒浩, 向宇姝, 张玉鹏, and 谭 芳
- Abstract
Copyright of Polymer Materials Science & Engineering is the property of Sichuan University, Polymer Research Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2024
- Full Text
- View/download PDF
18. The Effect of Epoxy Resin on the Infiltration of Porous Metal Parts Formed through Laser Powder Bed Fusion.
- Author
-
Chen, Jibing, Liu, Yanfeng, She, Yong, Yang, Yang, Du, Xinyu, Yang, Junsheng, and Wu, Yiping
- Subjects
POROUS metals ,METALWORK ,IRON powder ,EPOXY resins ,FOURIER transform infrared spectroscopy ,BIOMATERIALS - Abstract
Laser powder bed fusion (L-PBF) additive manufacturing technology can print multi-material parts with multiple functions/properties, and has great potential for working in harsh application environments. However, the metal blank formed by sintering metal powder material with binder added through L-PBF has an obvious porous structure and insufficient mechanical properties, and few studies have been conducted studying this. In this paper, epoxy resin was used to impregnate the blank of porous metal parts formed by L-PBF with iron-based powder material at a certain temperature, and a cross-linked curing reaction was carried out with three kinds of phenolic resin in different proportions under the action of a curing agent, so as to fill the pores and achieve the desired mechanical properties. The characteristic peaks of each group of epoxy resin were characterized using Fourier transform infrared spectroscopy (FT-IR) and H-nuclear magnetic resonance (
1 H-NMR) spectrums. The microstructure, decomposition temperature, and residue of four epoxy resin dispersion systems were analyzed with a scanning electron microscope (SEM), a thermal gravimetric analyzer (TGA), and derivative thermogravimetry (DTG). The results show that the density of the porous metal parts was obviously improved, the heat resistance temperature of the parts could reach 350 °C, and the tensile strength of the sample after EP2-1 impregnation was increased by 4–6 times after curing at 160 °C for 6 h. Therefore, the use of an epoxy resin dispersion system can increase the porosity of L-PBF porous metal parts, but can also significantly improve their mechanical properties, which can help them to meet the requirements of applications as model materials, biological materials, and functional materials to provide a feasible solution. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
19. Insulation degradation affected by micron metal particles attached on epoxy surface: charge accumulation and flashover voltage.
- Author
-
Yang, Zhuodong, Qi, Bo, Yang, Xiao, Gao, Chunjia, Zhang, Yi, Luo, Yuan, Sun, Caixin, and Li, Chengrong
- Subjects
SURFACE charging ,VOLTAGE ,EPOXY resins ,HIGH voltages ,METALS ,FLASHOVER ,SURFACE charges - Abstract
The micron metal particles are inevitably produced in long-term operation condition of high voltage direct current SF
6 insulated apparatus, which could frequently cause the surface discharge. Degradation of long-term surface discharge will be a severe threat to the insulation strength. Aiming at this problem, the surface charge accumulation and flashover voltage of epoxy itself before and after discharge degradation by particles were compared in this paper. The composition after degradation was measured by EDS and FTIR. The microstructure was observed by SEM. The roughness was measured as well. The trap distribution was measured by SPD. The mechanism of degradation and its effect on insulation characteristics were analyzed. The results show that the surface charge accumulation increase three times after degradation. Additionally, flashover voltage decreases 19% after degradation. The smoothly surface after degradation decrease the trap energy level for 14%, which might be the change reason of surface charge accumulation and flashover voltage. This paper can offer as a reference for the effect of micron metal particles on insulation degradation in SF6 gas insulated equipment. [ABSTRACT FROM AUTHOR]- Published
- 2022
- Full Text
- View/download PDF
20. 金属有机框架基阻燃剂在阻燃领域的研究进展.
- Author
-
王 栋
- Abstract
Copyright of China Plastics / Zhongguo Suliao is the property of Journal Office of CHINA PLASTICS and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2024
- Full Text
- View/download PDF
21. Improving the thermal conductivity of PMIA/EP composites by the synergistic effect of modified boron nitride and graphene oxide.
- Author
-
Yue, Mengjie, Pu, Zejun, Wu, Fang, Zhu, Rongli, Wang, Xu, Yu, Dayang, and Zhong, Jiachun
- Subjects
- *
THERMAL conductivity , *GRAPHENE oxide , *BORON nitride , *EPOXY resins , *COMPOSITE materials , *THERMAL stability - Abstract
In this study, h-BN-OH was obtained by hydroxylating h-BN and subsequently KH560 was grafted onto the surface of h-BN-OH, resulting in h-BN-KH560. The h-BN-KH560 was then dispersed in an epoxy resin (EP) to create an EP/h-BN-KH560 adhesive solution, with the content of h-BN-KH560 being varied. Graphene oxide (GO) was dispersed in PMIA precipitated fibers to produce PMIA/GO composite paper. Finally, the surface of the composite paper was evenly coated with the EP/h-BN-KH560 adhesive solution, and then PMIA/EP/GO/h-BN composites with different h-BN-KH560 contents and good thermal conductivity were prepared by hot pressing. The FTIR analysis confirmed the successful grafting of KH560 onto the surface of h-BN-OH. By utilizing h-BN-KH560 and GO as thermal conductive fillers, we achieved a higher thermal conductivity in the composite material, creating a "dual thermal conductivity network" compared to using a single filler. Additionally, the thermal conductivity increased as the content of h-BN-KH560 increased. At h-BN-KH560 contents of 20 wt%, 40 wt%, and 60 wt%, the thermal conductivities of the prepared PMIA/EP/GO/h-BN composites were 0.661 Wm−1K−1, 1.082 Wm−1K−1, and 1.206 Wm−1K−1, respectively. Importantly, the addition of the thermal conductive filler did not significantly affect the thermal stability of the composites. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
22. Comparing the Effects of ZnO and ZrO2 Nanomaterials on the Mechanical, Chemical, and Crystalline Properties of Epoxy Resin (DGEBA).
- Author
-
Rahmah, Nisreen Mizher
- Subjects
EPOXY resins ,NANOSTRUCTURED materials ,ZIRCONIUM oxide ,SCANNING electron microscopes ,ZINC oxide ,COMPRESSIVE strength - Abstract
This research paper presents a comparative experimental study on the impact of zinc oxide and zirconium dioxide nanomaterials on the chemical, mechanical, and crystalline properties of epoxy resin (diglycidyl ether of bisphenol-A). Nanomaterials were incorporated into the epoxy resin at three different concentrations (4%, 6%, and 8%) by weight. Results indicated enhanced properties of the epoxy resin, including tensile and compressive strengths, as well as improvements in chemical and crystalline characteristics, assessed through scanning electron microscope (SEM) and Fouriertransform infrared spectroscopy (FTIR). Notably, zirconium dioxide exhibited superior performance across all properties, enhancing tensile and compressive strengths by 67% and 50%, respectively. Zinc oxide, at the same concentrations, led to a 50% increase in tensile strength and a 40% increase in compressive strength. These outcomes were observed at the highest concentration (8%wt) of both nanomaterials and the pure epoxy resin. The presence of nanomaterials at this ratio promoted greater cohesion within the composite, as evidenced by SEM images of selected samples. SEM analysis highlighted the pivotal role of ZrO
2 nanoparticles in improving epoxy integration, surface quality, crystallization, and imperfection removal, crucial factors for enhancing composite materials. FTIR analysis of the resin containing ZrO2 nanoparticles revealed shifts and alterations in peaks, indicating successful nanoparticle-epoxy interaction, resulting in notable structural changes. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
23. Dielectric Properties and Corona Resistance of Si–Mg–B/EP Nano-composites.
- Author
-
Chen, Hao, Zhou, Yu, Zhao, Wei, Liu, Changwei, Song, Jixiang, Huang, Ziwei, Lin, Xiaoyi, and Weng, Ling
- Subjects
DIELECTRIC properties ,DIELECTRIC loss ,EPOXY resins ,PERMITTIVITY ,INDUSTRIAL electronics ,CORONA discharge - Abstract
In order to meet the increasing requirements of epoxy resin matrix materials for the electrical and electronics industry, this paper presents the design and synthesis of Si–Mg–B oxides using Mg, Si and B organic monomers, and preparation of Si–Mg–B/EP nanocomposites by ultrasonic dispersion and thermal curing. Mainly study the effect of composite oxide introduction on the dielectric properties of epoxy resin composites. With an increase in doping amount, the Si–Mg–B/EP nanocomposites show an increase in dielectric constant under working frequency test conditions; a decrease in dielectric loss followed by an increase, and the lowest value of 0.00238 is obtained at a doping amount of 8 wt%. The volume resistivity initially increases and then decreases, with the maximum value of 5.64 × 10
16 Ω cm obtained at a doping amount of 8 wt%. Furthermore, the corona resistance life of Si–Mg–B/EP nanocomposites increases, with a value of 401.8 min obtained at a doping amount of 8 wt%, which is 4.65 times that of pure EP. And the morphology near the breakdown point of corona breakdown was analyzed. These results suggest that Si–Mg–B oxide is effective in improving the dielectric loss and corona resistance of epoxy resin. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
24. Progress in polymeric and metallic brake pads: A comprehensive review.
- Author
-
Bilvatej, B., Naveen, J., Karthikeyan, N., Norrrahim, M. N. F., Knight, Victor Feizal, Jawaid, M., Sultan, M. T. H., Dagalahal, Mallikarjuna Reddy, Chandrasekar, M., and Loganathan, Tamil Moli
- Abstract
The use of asbestos in brake pads is being eliminated due to its carcinogenic effect. Due to this, there is a need for better alternative in the brake pad material to replace asbestos fibers. This leads to the development of more natural fibers/filler-based brake pads which are safer to the environment, cheaper, and readily available. Moreover, bio fillers-based brake pads have shown excellent performance compared to asbestos. This paper addresses the different composition of brake pad materials and manufacturing techniques. Common binders like epoxy resin, Phenolic resin-based brake pads were analyzed and its effect on the mechanical, tribological, and thermal performance were critically analyzed. Also, the performance of metal matrix-based brake pad has been analyzed in detail. It has been observed that utilizing natural fibers as a reinforcement provides an excellent braking performance compared to metallic and carbon fiber-based brake pads. This research will open new avenues towards "Net Zero." [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
25. Wood-based composite materials in the aspect of structural new generation materials. Recognition research.
- Author
-
CZAJKOWSKA, Anna, RYDZKOWSKI, Tomasz, and LASKOWSKA, Dorota
- Subjects
COMPOSITE materials ,CONSTRUCTION materials ,WOOD chips ,MATERIALS testing ,FIBROUS composites ,WIND turbine blades - Abstract
Composite materials are a constantly evolving group of engineering materials, which has significantly changed their current, and potential role as structural materials over the past decades. Composites offer greater strength, stiffness, and less deformation to structural designers than previously available engineering materials. Resin matrix composites are widely used in the transportation, marine, aerospace, energy, and even sports industries. The manufacturing stage has a profound influence on the quality of the final product. This paper presents the production of composite materials by gravity casting in silicone moulds, using an epoxy/polyester resin matrix reinforced with wood chips and shredded glass fiber reinforced composite from recycled wind turbine blades. Some of the fabricated samples were degassed in a reduced-pressure chamber. The mechanical properties of the produced material were then examined. It was noted that the silicone moulds did not affect the resin self-degassing due to the large surface area to weight ratio, and the remaining small air bubbles had a limited effect on the mechanical properties of the samples. The filler used also played a significant role. Composites filled with crushed GFRC showed better strength properties than composites filled with wood chips. The conducted research is aimed at selecting materials for further testing with a view to their use in the manufacture of next-generation wood-based composite structural materials. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
26. Studying the Rheokinetics of Curing Processes in Epoxy Amine Binders Modified with Carding Polysulfon.
- Author
-
Polunin, S. V., Gorbunova, I. Yu., Kerber, M. L., Khokhlova, E. V., Kryuchkov, I. A., and Kravchenko, T. P.
- Abstract
In this paper, the rheokinetics of curing processes in epoxy amine binders modified with PSFF-70K carding polysulfon copolymer is studied in the regime of permanent shear and oscillation. The used curing agent is 4,4'-diaminodiphenylsulfon. The viscosity growth constants and gel formation activation energies are calculated. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
27. Development of Recycled Natural Fiber Based Composite Material by Hand Lay-Up Process and Analysis of Its Acoustic & Physical Properties.
- Author
-
Mondal, Moni Sankar, Sarkar, Joy, Hasan, Naimul, Al Mehedi, Hasan, and Dutta, Pial
- Subjects
NATURAL fibers ,COMPOSITE materials ,FIBROUS composites ,HYBRID materials ,ABSORPTION of sound ,EPOXY resins ,SILICA gel - Abstract
Copyright of Journal of Natural Fibers is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2022
- Full Text
- View/download PDF
28. Al2O3 -Sn57Bi43/环氧树脂复合材料的 导热及电性能.
- Author
-
杨李懿, 葛凡, 汪蔚, 冉涛, and 李艳飞
- Abstract
Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2023
- Full Text
- View/download PDF
29. 硅磷双改性环氧树脂的合成及阻燃性能.
- Author
-
曹东风, 刘江波, 冀运东, 胡海晓, 陈新昌, 李晨阳, 陈 震, and 李书欣
- Abstract
Copyright of Polymer Materials Science & Engineering is the property of Sichuan University, Polymer Research Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2023
- Full Text
- View/download PDF
30. Possibilities of Influencing the Crystallization Process of Bisphenol A- and Bisphenol F-Based Epoxy Resins Used for Hydrophobic Coatings on Concrete.
- Author
-
Seidlová, Michaela, Hodul, Jakub, Žižková, Nikol, and Borg, Ruben Paul
- Subjects
EPOXY resins ,EPOXY coatings ,EDIBLE coatings ,CHEMICAL testing ,BISPHENOL A ,CRYSTALLIZATION ,CHEMICAL resistance ,NUCLEATING agents - Abstract
Crystallization of bisphenol A (DGEBA)- and bisphenol F (DGEBF)-based epoxy resins is a natural property of these oligomers. However, manufacturers of coatings and other systems based on these epoxy resins are making efforts to slow down the crystallization process as much as possible, thereby extending the shelf life and improving the competitiveness of their products. This paper focuses on the kinetics of the crystallization process of epoxy resins and the effect of the presence of a certain degree of crystallinity on selected parameters of epoxy-based materials. Furthermore, an analysis of the impact of a certain degree of crystallinity of the epoxy base on the resulting coating parameters was carried out. The highest value of crystallinity (17%) was achieved in the sample containing the highest proportion of DGEBF in the crystallization phase "c", and the enthalpy of melting (H
t ) of the crystalline DGEBF sample was 6.3 J/g. Mechanical parameters as well as chemical and thermal resistance of hydrophobic epoxy systems were investigated. The best abrasion resistance (1.5 cm3 /50 cm2 ) was achieved with the blend containing only amorphous DGEBA. The adhesion of the epoxy samples on concrete was greater than 6.5 MPa. The chemical resistance tests performed showed that, in general, the chemical resistance of epoxy systems decreases with increasing crystallinity content. The tighter arrangement of molecules in the crystalline regions of the epoxy matrix results in an increase in density, strength and hardness. This study presents a comprehensive examination of the crystallization of DGEBA and DGEBF, which is, as yet virtually unavailable. It also contributes to knowledge by outlining the possibility of speeding up or slowing down the crystallization process of epoxy resins, including the principle of selecting nucleating agents. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
31. Improved Interlaminar Properties of Glass Fiber/Epoxy Laminates by the Synergic Modification of Soft and Rigid Particles.
- Author
-
Liu, Jingwei, Tian, Shenghui, Ren, Jiaqi, Huang, Jin, Luo, Lin, Du, Bing, and Zhang, Tianyong
- Subjects
EPOXY resins ,GLASS fibers ,LAMINATED materials ,SHEAR strength ,FRACTURE toughness ,MATERIAL plasticity ,RUBBER ,HYDROGEN as fuel - Abstract
Poor interlaminar fracture toughness has been a major issue in glass fiber-reinforced epoxy resin (GF/EP) laminate composites. In this paper, soft carboxy-terminated nitrile (CTBN) rubber particles and rigid nano-SiO
2 are used to toughen the epoxy resin (EP) matrix to improve the interlayer properties of GF/EP laminate composites. The effects of adding two toughening agents on the mechanical and interlayer properties of GF/EP laminates were studied. The results showed that adding the two kinds of particles improved the mechanical properties of the epoxy matrix. When the additional amount of flexible CTBN rubber particles was 8 wt%, and the rigid nano-SiO2 was 0.5 wt%, the fracture toughness of the matrix resin was increased by 215.8%, and the tensile strength was only decreased by 2.3% compared with the pure epoxy resin. On this basis, the effects of two kinds of particles on the interlayer properties of GF/EP composites were studied. Compared with the unmodified GF/EP laminates, the interlayer shear strength and mode I interlayer fracture toughness is significantly improved by a toughening agent, and the energy release rate GIC of interlayer shear strength and interlayer fracture toughness is increased by 109.2%, and 86.8%, respectively. The flexible CTBN rubber particles and rigid nano-SiO2 improve the interfacial adhesion between GF and EP. The cavitation of the two particles and the plastic deformation of the matrix is the toughening mechanism of the interlayer properties of the composite. Such excellent interlaminar mechanical properties make it possible for GF/EP laminates to be widely used as engineering materials in various industries (e.g., aerospace, hydrogen energy, marine). [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
32. Moisture absorption behavior and diffusion characteristics of continuous carbon fiber reinforced epoxy composites: a review.
- Author
-
Korkees, Feras
- Abstract
Throughout their service life, carbon fiber reinforced epoxy composites are exposed to a range of environmental conditions. The long-term durability of these composites is an ongoing concern because exposure to moisture can degrade the polymeric matrix and deteriorate the mechanical properties of the composite. Carbon fiber reinforced epoxy composites are sensitive to their environments via humidity, elevated temperatures, and liquid exposure. This paper reviews the moisture uptake behavior and diffusion characteristics of continuous carbon fiber epoxy composites which will serve as a good source for understanding the moisture diffusion behavior of these composites in hot/wet environments. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
33. 3M™ 实心陶瓷微球在瓷器补配中的性能研究.
- Author
-
宋子贤 and 温建华
- Abstract
Copyright of Bulletin of the Chinese Ceramic Society is the property of Bulletin of the Chinese Ceramic Society Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2023
34. Breakdown strength-enhancing study on anti-corona nonlinear material for high-voltage generator stator coils
- Author
-
Yang, Zhou, Chi, Minghe, Zhang, Xiaorui, Wang, Ruipeng, Sun, Xue, and Chen, Qingguo
- Published
- 2024
- Full Text
- View/download PDF
35. Thermal and mechanical properties of recyclable epoxy asphalt vitrimers
- Author
-
Jing, Fan, Wu, Chengwei, Yang, Haocheng, Li, Chenxuan, Xi, Zhonghua, Cai, Jun, Wang, Qingjun, and Xie, Hongfeng
- Published
- 2024
- Full Text
- View/download PDF
36. Simulation of γ-Ray Radiation Shielding Utilizing Gd2O3/Bi2O3/Epoxy Resin
- Author
-
Cao, Rongxing, Li, Guangyao, Hu, Dike, Wang, Yiyuan, Wang, Lei, Li, Hongxia, Xue, Yuxiong, and Zeng, Xianghua
- Published
- 2024
- Full Text
- View/download PDF
37. Structural Potting of Large Aeronautic Honeycomb Panels: End-Effector Design and Test for Automated Manufacturing.
- Author
-
Campos, Carlos, Casarejos, Enrique, and Segade, Abraham
- Subjects
HONEYCOMB structures ,HONEYCOMBS ,TEST design ,MANUFACTURING processes ,METALS ,AUTOMATION - Abstract
Structural potting is used to prepare honeycomb panels to fix metallic elements, typical in aircraft doors. In this paper, a full procedure for structural potting using robotic arms is presented for the first time. Automating this procedure requires the integration of, first, machining operations to remove the skin layers and prepare the potting points and, then, resin injection into the honeycomb cells. The paper describes the design, prototyping, and testing of specific end-effectors. Different end-effectors were explored to ensure efficient injection. The results obtained with the prototypes show that the potting quality is adequate to accomplish the required process checks for industrial manufacturing. The injection process time can be reduced by a factor greater than 3.5, together with the extra assets associated with the automation of complex tasks. Therefore, structural potting automation is demonstrated to be feasible with the end-effectors proposed for milling and injection, which are ready for use with conventional robotic arms in manufacturing lines. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
38. Improved performance of epoxy resin coating with the modification of dopamine doped Ti4O7.
- Author
-
Lin, Huanhuan, Wang, Yanli, and Li, Weihua
- Subjects
- *
COMPOSITE coating , *CHEMICAL bonds , *EPOXY resins , *IRON chelates , *SUBSTRATES (Materials science) , *EPOXY coatings , *SURFACE coatings - Abstract
In this paper, a dense and well‐adherent polydopamine‐Ti4O7/epoxy resin (PDA‐Ti4O7/EP) composite coating is successfully prepared. The modified grafting of Ti4O7 by polydopamine (PDA) is achieved through the coordination complexation of unstable catechol groups in PDA with coordination unsaturated Ti atoms in Ti4O7. The potentiodynamic polarization curve and electrochemical impedance spectroscopy test results show that the performance of the composite coating is improved compared with that of the pure epoxy coating, and the composite coating slows down the penetration of electrolytes and aggressive ions and improves the corrosion resistance. The composite coating with 2 wt.% PDA‐Ti4O7 filler shows the best corrosion resistance, and its |Z|0.01 Hz remains above 1011 Ω cm2 after 30 days of immersion in 3.5 wt% NaCl solution. This can be attributed to the good barrier property of PDA‐Ti4O7 filler, which carries NH2 and OH reactive groups, interacting with the resin and matrix to improve the dispersion of the filler and the adhesion of the composite coating. The NH2 group reacts with the epoxy group in the epoxy resin in a ring‐opening reaction, which avoids the agglomeration of the filler and the uniformly dispersed filler fills the pores in the coating due to curing to improve the denseness of the coating and give full play to the barrier property of the filler. At the same time, the hydrogen bonding between the filler and the OH group in the resin and the substrate increases the adhesion of the coating. In addition, the unstable catechol group in PDA chelates with iron ions to further improve the overall corrosion resistance of the coating. Highlights: A dense and well‐adherent PDA‐Ti4O7/EP coating is successfully prepared.PDA connect with Ti4O7 through coordination of catechol groups and Ti atom.PDA‐Ti4O7 are chemically bonded to the EP through a ring‐opening reaction.PDA‐Ti4O7 improves the crosslinking density and barrier ability of the coating. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
39. Improved performance of epoxy resin coating with the modification of dopamine doped Ti4O7.
- Author
-
Lin, Huanhuan, Wang, Yanli, and Li, Weihua
- Subjects
COMPOSITE coating ,CHEMICAL bonds ,EPOXY resins ,IRON chelates ,SUBSTRATES (Materials science) ,EPOXY coatings ,SURFACE coatings - Abstract
In this paper, a dense and well‐adherent polydopamine‐Ti4O7/epoxy resin (PDA‐Ti4O7/EP) composite coating is successfully prepared. The modified grafting of Ti4O7 by polydopamine (PDA) is achieved through the coordination complexation of unstable catechol groups in PDA with coordination unsaturated Ti atoms in Ti4O7. The potentiodynamic polarization curve and electrochemical impedance spectroscopy test results show that the performance of the composite coating is improved compared with that of the pure epoxy coating, and the composite coating slows down the penetration of electrolytes and aggressive ions and improves the corrosion resistance. The composite coating with 2 wt.% PDA‐Ti4O7 filler shows the best corrosion resistance, and its |Z|0.01 Hz remains above 1011 Ω cm2 after 30 days of immersion in 3.5 wt% NaCl solution. This can be attributed to the good barrier property of PDA‐Ti4O7 filler, which carries NH2 and OH reactive groups, interacting with the resin and matrix to improve the dispersion of the filler and the adhesion of the composite coating. The NH2 group reacts with the epoxy group in the epoxy resin in a ring‐opening reaction, which avoids the agglomeration of the filler and the uniformly dispersed filler fills the pores in the coating due to curing to improve the denseness of the coating and give full play to the barrier property of the filler. At the same time, the hydrogen bonding between the filler and the OH group in the resin and the substrate increases the adhesion of the coating. In addition, the unstable catechol group in PDA chelates with iron ions to further improve the overall corrosion resistance of the coating. Highlights: A dense and well‐adherent PDA‐Ti4O7/EP coating is successfully prepared.PDA connect with Ti4O7 through coordination of catechol groups and Ti atom.PDA‐Ti4O7 are chemically bonded to the EP through a ring‐opening reaction.PDA‐Ti4O7 improves the crosslinking density and barrier ability of the coating. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
40. Molecular dynamics study on the thermal properties of DGEBA/DETA/Ag/SWCNT-Ag composite materials.
- Author
-
Wang, Yunkai, Jing, Danlei, Xiong, Zikai, Yu, Chunxiu, Li, Wei, Huang, Jianguo, and Sun, Zhi
- Abstract
Context: Traditional conductive adhesives based on epoxy resin system often encounter problems such as high brittleness and low heat resistance. Therefore, it is particularly important to improve the thermal and mechanical properties of the conductive adhesive. In this study, the effects of SWCNT-Ag and SWCNT fillers on the thermal properties of DGEBA/DETA/Ag conductive adhesive system were studied by using molecular dynamics to construct different cross-linking models. The final results show that the addition of SWCNT and SWCNT-Ag can significantly improve the thermal properties of the conductive adhesive. However, the nanosilver particles on the surface of SWCNT-Ag act as a bridge for the connection between SWCNT and Ag in the conductive adhesive. Therefore, SWCNT-Ag has a more positive impact on the thermal properties of DGEBA/DETA/Ag conductive adhesive system. Methods: In this paper, the influence of SWCNT-Ag on the thermal properties of traditional DGEBA/DETA/Ag conductive adhesive system was studied by using Materials Studio software. The volume shrinkage, glass transition temperature, thermal expansion coefficient, and thermal conductivity of the material were calculated based on COMPASS force field. The thermal conductivity is calculated by using reverse non-equilibrium molecular dynamics method. Finally, it is found that SWCNT-Ag has a positive effect on the thermal properties of the conductive adhesive system by comparing several groups of calculation data. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
41. Characterization and modeling of an epoxy vitrimer based on disulfide exchange for wet filament winding applications.
- Author
-
Lorenz, N., Zawadzki, T., Keller, L., Fuchs, J., Fischer, K., and Hopmann, Ch.
- Subjects
FILAMENT winding ,MANUFACTURING processes ,ELASTIC modulus ,POLYMERS ,ADVICE - Abstract
The present paper investigates the suitability of a vitrimeric epoxy resin for processing in the wet filament winding (WFW) process to manufacture fiber‐reinforced polymers (FRP). Comprehensive material characterization of a commercially available epoxy and vitrimeric resin based on disulfide exchange is carried out, and the processing in WFW is evaluated by analyzing thermomechanical, rheological, thermochemical properties, and chemical shrinkage. The direct comparison of a vitrimer and an established epoxy resin permits an indication of the processability and necessary adjustments in WFW. Based on the implications of modeling, we demonstrate the processing of the vitrimeric resin in the WFW process by increasing the resin bath temperatures. The vitrimer's and conventional resin's elastic modulus development and compression behavior were similar, highlighting the vitrimeric resin's potential. Further, the results confirm that established characterization and modeling routines can be transferred to vitrimeric resins and, therefore, path the way toward advanced process simulation of vitrimeric resin's processing. For this, the present publication gives essential advice for setting up testing schedules for characterizing epoxy vitrimers' processing behavior and their appropriate modeling. The present work underlines the potential of applying commercially available dynamic hardeners to manufacture recyclable and malleable FRP in established processes. Highlights: Material characterization and modeling of wet filament winding process.Wet filament winding of epoxy vitrimers.Thermomechanical and chemical shrinkage characterization of epoxy vitrimers.Rheological and kinetic modeling of epoxy vitrimer. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
42. Enhance the fire safety of epoxy resin using ammonium polyphosphate flame retardant with the sandwich structure containing catalytic carbon formation function.
- Author
-
Zheng, Penglun, Zhao, Haihan, Li, Junwei, Liu, Quanyi, Yang, Xulin, and Zhou, Yumei
- Subjects
FIREPROOFING agents ,FIRE resistant polymers ,FIRE prevention ,FIRE resistant materials ,EPOXY resins ,SANDWICH construction (Materials) ,FLAMMABLE gases - Abstract
Ammonium polyphosphate (APP) is often used to construct intumescent flame retardant systems together, but it is faced with the problem of adding too much flame retardant. This paper envisions the construction of a modified APP flame retardant (TR@ZIFAPP) with a sandwich structure by the method of covering, which, in order to endow APP flame retardant with better flame retardant effect. By constructing a metal catalytic layer and a triazine carbon formation layer, the modified APP flame retardant has both catalytic carbon formation and phosphorus–nitrogen synergistic flame retardant functions. TR@ZIFAPP is expected to be used in flame‐retardant polymer composites with low addition requirements, adding it to epoxy resin (EP) reveals that the TR@ZIFAPP flame retardant could achieve the optimal flame retardant effect when the addition amount was only 3 wt%. The UL‐94 rating reached V‐0 grade, and the two off‐fire auto‐ignition time levels were only 0.7 s. The analysis of its flame retardant mechanism showed that the flame retardant in EP was mainly through the rapid formation of carbon to isolate oxygen and dilute the flammable gas to reach a strong flame retardant effect. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
43. Preparation and Evaluation of Epoxy Based Material for High Performance Electronic Packaging through the Surface Modification of Fillers.
- Author
-
Yi, Rongjun, Ke, Jiexi, Zhou, Jianwen, and Wang, Hong
- Subjects
- *
ELECTRONIC packaging , *COUPLING agents (Chemistry) , *ELECTRIC insulators & insulation , *THERMAL expansion , *THERMAL conductivity , *EPOXY resins - Abstract
AbstractThe continuous integration and refinement of electronic equipment results in the more stringent requirements for epoxy resin (EP) based materials, such as excellent heat dissipation and low coefficient of thermal expansion (CTE). In order to improve the dispersion of silica powder (SP) in EP and thus expand the application of EP in the field of electronic packaging, our research described in this paper adopted the KH-550 coupling agent to modify the surface of SP (m-SP). The effects of KH-550 coupling agent on the characteristics of the composites were investigated in terms of thermal, rheological, electrical insulation and mechanical properties. The results showed that when the content of KH-550 was 2 wt% of the fillers, the best modification effect was achieved, and the surface properties of the fillers were changed accordingly. In particular, the materials filled with m-SP exhibited lower viscosity end, better mechanical and electrical insulation properties. It was also found that the adding of the KH-550 had different effects on the thermal degradation, dynamic thermo-mechanical properties and the thermal deformation behavior of the materials. According to our study, the thermal conductivity and the CTE of m-SP/EP filled with 70 wt% of modified fillers were 0.787 W/m.K and 28.3 ppm/°C respectively, corresponding to a significant thermal conductivity improvement and low CTE. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
44. 环氧/聚酯复合树脂导电银浆的制备与研究.
- Author
-
赵科良, 王大林, 赵云龙, 刘振国, 孙欣烨, and 卢睿涵
- Abstract
In this paper, the rheological, electrical and mechanical properties of silver paste with different blends of epoxy resin and polyester resin were studied. The thixotropy and thixotropy recovery rate of resin silver paste were studied by rheometer, and the effect of rheology on printing film was discussed. In situ curving resistance test method was used to monitor the change of thermal curing resistance of silver resin paste. The results showed that the content of epoxy resin in silver paste had great influence on the resistance. The adhesion strength of resin silver paste on Al2O3 substrate was evaluated by the thrust test method, and the thermal impact performance of resin silver paste was evaluated. The results showed that when the ratio of epoxy resin to polyester resin was 1:0.6, the viscosity of C-1 silver paste was moderate, the thixotropic recovery rate was 58.03% after 10 s, and the printing surface was flat. After curing at 200 ℃ for 30 min, the resistance is about 2 Ω, the adhesion strength is about 10 N/mm², and the adhesion strength is not significantly deteriorated after thermal shock at 260 ℃. The comprehensive performance is better, and it is suitable for the process requirements of electronic components. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
45. Analysis of the glass fibre/chicken feathers reinforced hybrid composite.
- Author
-
Mishra, R. K. and Singh, G.
- Subjects
- *
GLASS fibers , *HYBRID materials , *CHICKENS , *GLASS analysis , *FEATHERS , *POLYESTERS - Abstract
In this paper glass/chicken feathers reinforced epoxy composite and glass/chicken feathers reinforced polyester composite was prepared in the laboratory at different percentage of the glass and chicken feathers. Tensile properties, flexural properties, shore hardness and impact strength of the glass/chicken feathers reinforced epoxy composite and glass/chicken feathers reinforced polyester composite was studied experimentally and compared at different percentage of the glass and chicken feathers. The composite will be used in humid and corrosive environment; therefore, water absorption and acid corrosion test were performed. To understand the degradation behaviour of the composite, soil test was performed. Scanning electron microscopy analysis was carried out to find the fracture and interfacial characteristics of the composites after tensile test. This hybrid composite can be used in automobile, structural and defense sector. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
46. Simultaneously improving interfacial adhesion and toughness of carbon fiber reinforced epoxy composites by grafting polyethyleneimine on the carbon fiber surface to construct a rigid‐flexible interface.
- Author
-
Zhang, Guosheng, Xu, Haibing, Zhu, Yingdan, Yan, Chun, Liu, Dong, Chen, Gang, and Xiao, Zhiqiao
- Abstract
Highlights Chemical grafting is commonly employed to functionalize carbon fiber (CF) surface to enhance the interfacial properties of CF reinforced polymer composites (CFRP) by forming a robust interface. However, an overly rigid interface layer can result in relatively poor interface toughness. To balance interfacial strength and toughness, this paper proposes an effective method to simultaneously strengthen and toughen the interface of CF/epoxy composites by grafting branched polyethyleneimine (PEI) on CF surface using hexachlorophosphazene (HCCP) as active intermediate, which features a rigid ring structure and six active P‐Cl groups. The introduction of PEI provided a large number of amine and imine groups on CF surfaces, which were contributive to improving surface wettability and reactivity of CF, thus resulting in strong chemical bonding between CF and epoxy matrix. Additionally, the long and flexible molecular skeleton of PEI constructed a rigid‐flexible composite interface, which could effectively reduce stress concentration and absorb impact energy. After surface modification with PEI, the interfacial shear strength and fracture toughness of CF/epoxy composite were increased to 89.9 MPa and 200.3 J m−2, by 64.3% and 149.7%, respectively, in compared with desized CF reinforced epoxy composites. A rigid‐flexible interface was constructed between CF and epoxy resin. The interfacial strength and toughness of CFRP were synergistically improved. IFSS and interfacial toughness increased by 64.3% and 149.7%, respectively. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
47. Scratches Resistance of Polyester Epoxy Matt Powder Coating and Improvement of Bright Mark Defects.
- Author
-
Hou Jiashu and Cai Jinshu
- Abstract
In this paper, the effects of different polyester resins, epoxy resins, fillers, different additives and extrusion processes on the surface scratch resistance of polyester epoxy matt powder coating and the improvement of surface bright marks are described. By adjusting the formula and process, the anti-scratch performance of the coating is improved. meanwhile, the bright mark defect on surface of coating is modified, which is useful to ensure product quality. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
48. 本征导热型绝缘液晶环氧树脂的研究进展.
- Author
-
潘红梅, 董群锋, 杨立峰, 刘传奇, and 裴克梅
- Abstract
Copyright of Paint & Coatings Industry (0253-4312) is the property of Paint & Coatings Industry Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2024
- Full Text
- View/download PDF
49. Development of epoxy resin with superior breakdown strength: A Review
- Author
-
Li Shengtao and Li Mingru
- Subjects
epoxy resin ,breakdown strength ,electrical insulation ,Production of electric energy or power. Powerplants. Central stations ,TK1001-1841 ,Renewable energy sources ,TJ807-830 - Abstract
Epoxy resin (EP) has been widely utilized in electrical equipment and electronic devices due to its fascinating electric, thermal, and mechanical properties. However, the complex insulation structures of modern power devices in high-voltage direct current systems pose several challenges for EP-based dielectrics. The most significant among these challenges is the need for EP to stably operate under greater electric fields, requiring superior breakdown strength. This paper summarizes the key factors influencing the breakdown strength of EP and reviews reported methods for enhancing this property. Recognizing the limitations of existing approaches, we propose that the emerging technology of molecule design offers a potentially optimal solution for developing EP with enhanced breakdown strength. Furthermore, we anticipate the future development direction of EP with satisfactory insulation properties. We believe that enhancing the breakdown theory of solid dielectrics, exploring new research and development methodologies, and creating environmentally friendly EP with high performance are primary focus areas. We hope that this paper will offer guidance and support for the future development of EP with superior breakdown strength, proving valuable in advancing EP-based dielectrics.
- Published
- 2024
- Full Text
- View/download PDF
50. Novel Bio-Based Materials: From Castor Oil to Epoxy Resins for Engineering Applications.
- Author
-
Gaina, Constantin, Ursache, Oana, Gaina, Viorica, Serban, Alexandru-Mihail, and Asandulesa, Mihai
- Subjects
CASTOR oil ,EPOXY resins ,PERACETIC acid ,WATER masses ,DIELECTRIC properties ,WATER testing - Abstract
The paper presents the synthesis and thermal behavior of novel epoxy resins prepared from epoxidized castor oil in the presence of or without trimethylolpropane triglycidyl ether (TMP) crosslinked with 3-hexahydro-4-methylphtalic anhydride (MHHPA) and their comparison with a petroleum-based epoxy resin (MHHPA and TMP). Epoxidized castor oil (ECO) was obtained via in situ epoxidation of castor oil with peroxyacetic acid. The chemical structures of castor oil (CO), ECO, and epoxy matrix were confirmed using FT-IR and
1 H-NMR spectroscopy. The morphological and thermal behavior of the resulting products have been investigated. Compared to petroleum-based resins, castor oil-based ones have a lower Tg . Anyway, the introduction of TMP increases the Tg of the resins containing ECO. The morphological behavior is not significantly influenced by using ECO or by adding TMP in the synthesis of resins. The dielectric properties of epoxy resins have been analyzed as a function of frequency (1 kHz–1 MHz) and temperature (−50 to 200 °C). The water absorption test showed that as Tg increased, the percent mass of water ingress decreased. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.