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135 results on '"Xu, Zhoumei"'

29. Combustion Inhibition Ability of Piperazine Phosphoramide Derivatives and Titanium Carbide on Epoxy Resin.

Author

Zhang, Zixuan, Xiao, Yuling, Zhou, Yifan, Zou, Bin, Xu, Zhoumei, Zhang, Shenghe, Song, Lei, Xing, Weiyi, and Hu, Yuan

Subjects
TITANIUM carbide, EPOXY resins, FIREPROOFING, HEAT release rates, PIPERAZINE, FIREPROOFING agents, DIFFUSION, ACTIVATION energy
Abstract

Herein, piperazine phosphoramide derivatives (PPDO) and titanium carbide modified by hexadecyl trimethyl ammonium bromide (c-Ti3C2) were blended with epoxy resin (EP) to fabricate EP/c-Ti3C2/PPDO nanocomposites. According to thermogravimetric analyzer (TGA) results and pyrolysis kinetic analysis, EP/c-Ti3C2/PPDO nanocomposites can improve the thermal stability and the activation energy of EP. Furthermore, thermal degradation mechanism of EP and its nanocomposites with conversion between 0.55 and 0.99 conforms to the F3 model. With 1 wt% c-Ti3C2 and 3 wt% PPDO incorporated, the LOI value of EP/c-Ti3C2-1/PPDO-3 can reach up to 32% while achieves V-0 rating in the UL-94 test. Based on the cone calorimeter results, the peak heat release rate of EP/c-Ti3C2-1/PPDO-3 reduced by 40.1%. More continuous and dense phosphorus-rich char residues were produced for EP/c-Ti3C2-1/PPDO-3 nanocomposites, which can act as a physical barrier to hinder the heat transfer, protect the underlying polymers from further decomposition and isolate the diffusion of combustible gases. The synergistic effect between c-Ti3C2 and PPDO in catalytic carbonization obviously accounts for the improved flame retardant performance. This work provides an insight into the flame retardant mechanism and the thermal degradation mechanism of c-Ti3C2 and PPDO on EP, showing a promising application potential of c-Ti3C2 and PPDO in enhancing the thermal stability and flame retardancy of EP. [ABSTRACT FROM AUTHOR]

Published
2023
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37. Magnetic Fe₃O₄ nanoparticle/ZIF-8 composites for contaminant removal from water and enhanced flame retardancy of flexible polyurethane foams

Author

Xu, Zhoumei, Chu, Fukai, Luo, Xiaoyu, Jiang, Xin, Cheng, Liang, Song, Lei, Hou, Yanbei, Hu, Weizhao, School of Mechanical and Aerospace Engineering, and HP-NTU Digital Manufacturing Corporate Laboratory

Subjects
Mechanical engineering [Engineering], Fire Safety, Metal−Organic Framework
Abstract

In order to separate heavy-metal ions from contaminated wastewater and further realize the reutilization of waste adsorbent, magnetic composites with flowerlike structure were successfully synthesized. After the absorption of Cu2+ions, hybrids can be used as effective coatings to enhance the fire safety of flexible polyurethane foam (FPUF) through a dip-coating method. As-fabricated metal-organic framework (MOF)-based composites exhibited a core-shell and flowerlike structure with high thermal stability. The maximum adsorption capacity for Cu2+could reach 292.13 mg·g-1, calculated from the Langmuir isotherm model. In order to reutilize the adsorbed Cu2+ions, the CuO-loaded MOF-derived Fe3O4@ZnO@CuO (MO) was obtained with a simple heat treatment. The effectivity of MO as a fire-safety coating for inhibiting the release of heat and toxic gases of FPUF was satisfactory. The application of this MOF-based composite will provide useful insights into the design of bifunctional materials for efficient wastewater remediation and fire-safety coatings. The research was financially supported by the National Natural Science Foundation of China (Grant 51874266), the Fundamental Research Funds for the Central Universities (WK2320000054) and the Open Project Program of Engineering Laboratory of Non halogen Flame Retardants for Polymers Beijing Technology and Business University, China(BTBUFR20-1).

Published
2022

38. Photothermal-healing, and record thermal stability and fire safety black phosphorus–boron hybrid nanocomposites: mechanism of phosphorus fixation effects and charring inspired by cell walls

Author

Zou, Bin, primary, Qiu, Shuilai, additional, Zhou, Yifan, additional, Qian, Ziyan, additional, Xu, Zhoumei, additional, Wang, Jingwen, additional, Xiao, Yuling, additional, Liao, Can, additional, Yang, Wenhao, additional, Han, Longfei, additional, Chu, Fukai, additional, Song, Lei, additional, Gui, Zhou, additional, and Hu, Yuan, additional

Published
2022
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