Thermal stability and curing kinetics of polycarbosilane fibers

来源期刊:中国有色金属学报(英文版)2006年第1期

论文作者:郑春满 李效东 王浩 朱冰

文章页码:44 - 44

关键词:polycarbosilane; SiC fibers; thermal stability; curing; kinetics

Key words:polycarbosilane; SiC fibers; thermal stability; curing; kinetics

Abstract: Thermal stability and curing kinetics of polycarbosilane (PCS) fibers were studied by thermogravimetry (TG), Fourier transform infrared spectroscopy(FT-IR). Curing is an essential step in the preparation of SiC fibers and the properties of SiC fibers are affected greatly by curing conditions. TG measurement performed in air shows that mass gain starts at approximately 200℃ and PCS fibers are sensitive to oxygen. Curing with oxygen, which results in crosslinking on the surface, enabled PCS fibers to retain its shape during high-temperature pyrolysis. The curing of PCS fibers is oxidation of Si─H and Si─CH3, then Si─O─Si and Si─O─C bonds are formed. This is a first order reaction, with activation energy of 79.27 kJ/mol, and the pre-exponential factor is calculated as 3.07×106. The kinetics model was obtained and the experimental data of PCS fibers show good agreement with the kinetics model.

基金信息:the National Natural Science Foundation of China

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