文献类型：期刊文献

英文题名：A novel boron-silicon-alkynyl hybrid copolymer

作者：Zhou, Qi[1]; Zhou, Quan[1]; Geng, Jie[1]; Ni, Li Zhong[1]

机构：[1] Key Laboratory of Special Functional Polymeric Materials and Related Technology, Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2017

卷号：29

期号：3

起止页码：249

外文期刊名：High Performance Polymers

收录：EI(收录号：20171403541287)

语种：英文

外文关键词：Ceramic materials - Crosslinking - Differential scanning calorimetry - Hydrosilylation - Curing - Polycondensation - Specific heat - Thermogravimetric analysis - Nitrogen - Nuclear magnetic resonance spectroscopy - Polysilanes - X ray diffraction - Silicon - Silicon carbide

摘要：A novel boron-silicon-alkynyl hybrid copolymer (BSD) was synthesized by condensation polymerization of 1,3-diethynylbenzene with dichloromethylsilane and boron trifluoride etherate. Fourier transform infrared and 1H-, 13C-, and 29Si-nuclear magnetic resonance spectroscopies were used to confirm the structures of the copolymers. Thermogravimetric analysis and differential scanning calorimetry showed that the polymer exhibited excellent heat resistance and thermo-oxidative stabilities under nitrogen and air. The cure cross-linking reaction mechanisms of the BSD were related to Diels-Alder intermolecular cyclization involving two C‰C bonds and hydrosilylation reaction between Si-H and C‰C bonds. The T d 5 of the BSD was above 591°C and 530°C under nitrogen and air, respectively. The residues at 1000°C were above 88% under nitrogen and 25% in air. X-ray diffraction was used to study the formation of ceramics. The precursor for ceramics (β-SiC, α-SiC, and B4C) was formed at 1600°C under an argon atmosphere. The thermo-oxidative stabilities of the copolymers were attributed to the existing organic groups of alkynyl and inorganic elements of silicon and boron. ? 2016 The Author(s).