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Synthesis and Polymer-to-Ceramic Conversion of Tailorable Copolysilazanes

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Synthesis and Polymer-to-Ceramic Conversion of Tailorable Copolysilazanes.htm (404bytes)
Date
2011-05-21
Author
Li, Ran
Zhou, Cong
Yang, Le
Li, Siwei
Zhan, Junying
Yu, Zhaoju
Xia, Haiping
夏海平
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  • 化学化工-已发表论文 [14469]
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Abstract
Tailorable copolysilazanes (CPSZs) with variable chemical structure and molecular weights were prepared by coammonolysis of dichloromethylsilane, dichloromethylvinylsilane, and trichloromethylsilane. The as-synthesized CPSZ was characterized by gel permeation chromatography, Fourier transformed infrared (FTIR) spectroscopy, and nuclear magnetic resonance spectroscopy. The CPSZ could be cured in an inert atmosphere at 180 degrees C for 24 h. Pyrolysis behavior and structure evolution of the cured CPSZ were studied by means of thermal gravimetric analysis and FTIR. Hydrosilylation, transamination, dehydrogenation, and demethanation reactions were involved in the polymer-to-ceramic conversion of CPSZ. The ceramization process was complete at 900 degrees C with a ceramic yield of 81-84%. Elemental analysis indicated that the compositions of final ceramics can be tailored by controlling the feed ratios of the starting chlorosilanes. Moreover, the microstructural evolution of the resultant Si-C-N ceramics was further investigated by X-ray diffraction, Raman spectroscopy, and transmission electron microscopy. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 122: 1286-1292, 2011
Citation
JOURNAL OF APPLIED POLYMER SCIENCE,2011,122(2):1286-1292
URI
http://dx.doi.org/doi:10.1002/app.34274
https://dspace.xmu.edu.cn/handle/2288/11481
WOS:000293741800067

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