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148 results on '"Yue, Xigui"'

19. A Novel PEEK Foam with Ultra‐High Temperature‐Resistant by Temperature Induced Phase Separation.

Author

Meng, Lingcheng, Zhang, Jinling, Zhao, Shuang, Qi, Desheng, Xu, Pan, Wu, Shuoqi, Wang, Le, Yue, Xigui, and Jiang, Zhenhua

Subjects
PHASE separation, FOAM, THERMAL properties, ENGINEERING plastics, HIGH temperatures, PLASTICS engineering
Abstract

Polyaryletherketone is a kind of special engineering plastics with excellent comprehensive properties, high strength, good stability, and almost insoluble in any common solvent except concentrated sulfuric acid at room temperature. However, its high processing temperature also hinders its application and development in the foam. Here, a series of polyetheretherketone (PEEK) and diphenyl polyetheretherketone (PEDEK) composite foams are prepared by temperature induced phase separation, using diphenyl sulfone as solvent. The microstructure, thermal and mechanical properties of PEEK and PEDEK foam are compared. Highly porous PEEK and PEDEK foams with densities ranging from 0.13 to 0.25 g cm−3, with compressive strength ranging from 0.68 to 2.6 MPa, respectively, are produced. Meanwhile, the introduction of diphenyl structure can effectively improve the performance of PEEK foams at high temperature. It is found that PEDEK foam has a higher operating temperature than PEEK, and the compressive strength of 0.24 g cm−3 foam is still ≈1 MPa at 200 °C. [ABSTRACT FROM AUTHOR]

Published
2023
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26. Effect of the addition of silane coupling agents on the properties of wollastonite-reinforced poly(ether ether ketone) composites

Author

Ma, Gang, Yue, Xigui, Zhang, Shuling, Rong, Changru, Wang, Lifeng, Wang, Guibin, and Wang, Hongliang

Subjects
Polyetheretherketone -- Thermal properties -- Mechanical properties -- Research, Silane -- Mechanical properties -- Thermal properties -- Research, Polymers -- Rheology, Polymeric composites -- Composition -- Thermal properties -- Mechanical properties -- Research, Wollastonite -- Mechanical properties -- Thermal properties -- Research, Engineering and manufacturing industries, Science and technology
Abstract

The wollastonite was grafted with different silane coupling agents, which could improve interface adhesion. Wollastonite and modified wollastonite-reinforced poly(ether ether ketone) (PEEK) composites were prepared by melt blending. The mechanical properties, rheology behavior, and thermal properties of the composites were investigated. The modified wollastonite-reinforced PEEK composites exhibited better mechanical properties than the unmodified wollastonite-reinforced PEEK composites based on good interfacial adhesion. The composites had lower activation volume and complex shear viscosity. Furthermore, the modified wollastonite-reinforced PEEK composites had higher crystallization peak temperature ([T.sub.c]) and crystalline fraction ([χ.sub.c]) compared with the unmodified wollastonite-reinforced PEEK composites. This study shows that the traditional silane coupling agents could effectively improve the performance of PEEK composites. POLYM. ENG. SCI., 51:1051-1058, 2011. [C]2011 Society of Plastics Engineers, INTRODUCTION Poly(ether ether ketone) (PEEK) is a kind of semicrystalline thermoplastic polymer with outstanding performance such as high temperature resistance, excellent chemical resistance, and superior mechanical properties [1, 2]. To [...]

Published
2011
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42. Development of a high-performance poly(ether ether ketone) copolymer with extremely low melt viscosity.

Author

Li, Yunxi, Zhao, Yunping, Liu, Tao, Yue, Xigui, and Jiang, Zhenhua

Subjects
RHEOLOGY, POLYETHERS, THERMAL stability, DIFFERENTIAL scanning calorimetry, POLYMERS
Abstract

The conventional poly(ether ether ketone) (PEEK) and two other PEEK copolymers (PEEEKK-PEK and PEEEKK-PEEEK) were successfully synthesized and investigated on their thermal stabilities, mechanical properties, and rheological behaviors. Both of the PEEEKK-PEK and PEEEKK-PEEEK were composed of the same chemical components with conventional PEEK (phenyl–ether–ketone equals 3:2:1), but the sequences of their components (phenyl, ether, and ketone) were different. Differential scanning calorimetry analysis and dynamic mechanical analysis indicate that PEEEKK-PEK and PEEEKK-PEEEK have extremely close glass transition temperatures and melting points with conventional PEEK, which suggests their similar operating temperatures. They also process similarly high mechanical properties based on their stress–strain tests. However, PEEEKK-PEK, PEEEKK-PEEEK, and PEEK exhibit significant differences in their rheological behaviors; PEEEKK-PEK even shows an excessively low melt viscosity (51% of PEEK). These results reveal the effects of sequence distribution on polymer properties and thereby demonstrate the processing viscosity of PEEK could be decreased without sacrificing its operating temperature or material performances. [ABSTRACT FROM AUTHOR]

Published
2018
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