文献类型：期刊文献

英文题名：Preceramic Polymer as Precursor for Near-Stoichiometric Silicon Carbon with High Ceramic Yield

作者：Qian, Xi[1];Zhou, Quan[1];Ni, LiZhong[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Special Funct Polymer Mat & Related Techn, Shanghai 200237, Peoples R China

年份：2015

卷号：132

期号：4

外文期刊名：JOURNAL OF APPLIED POLYMER SCIENCE

收录：;EI(收录号：20144700230011);WOS:【SCI-EXPANDED(收录号:WOS:000344362500011)】；

基金：The research in this paper was supported by the Chinese National Natural Science Foundation (51073053), Chinese National Postdoctoral Science Foundation (2013M541486), and Shanghai Postdoctoral Scientific Research Funding scheme. The authors are grateful for the financial support from the Shanghai postdoctoral scientific research funding scheme and the special fund of key research base of young teachers of East China University of Science and Technology.

语种：英文

外文关键词：applications; microscopy; thermogravimetric analysis TGA; thermosets; X-ray

摘要：Precursor polycarbosilane containing acetylenic and SiH group (PCAS) has been successfully prepared by the reaction of dilithioacetylene with methyl dichlorosilane, and characterized by gel permeation chromatography, Fourier transform infrared spectroscopy, H-1-NMR, C-13-NMR, and Si-29-NMR. Thermogravimetric analysis curve in nitrogen showed the temperature of 5 wt % weight losses (T-d5) was 613 degrees C, while the ceramic yield of PCAS was 88% at 1000 degrees C. Pyrolysis behavior and structure evolution of the cured PCAS were studied by means of X-ray diffraction, Raman, scanning electron microscope-energy dispersive X-ray spectrometer, transmission electron microscope (selected area electron diffraction and high resolution transmission electron microscope), and elemental analysis. The polymer to ceramic conversion was completed at 1600 degrees C and the results revealed that the ceramic consisted of -SiC and -SiC. The composition of the ceramic was near-stoichiometric with molar ratio of Si/C (1.02 : 1) except rare and localized free carbon inclusions. The SiC ceramics exhibited high thermo-oxidation resistance at elevated temperatures in air atmosphere. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41335.