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论文类型：期刊论文
发表时间：2015-07-04
发表刊物：DESIGNED MONOMERS AND POLYMERS
收录刊物：SCIE、EI、Scopus
卷号：18
期号：5
页面范围：479-485
ISSN号：1385-772X
关键字：1,1-diphenylethylene derivatives; thermal properties; ceramic precursor; functionalized polycarbosilane oligomers; hydrosilylation polymerization
摘要：Polycarbosilanes were prepared via hydrosilylation polymerization of functional 1,1-diphenylethylene (DPE) derivatives (dimethyl-[4-(1-phenylvinyl)phenyl]silane (DPE-SiH) and 1-(4-methyloxyphenyl)-1 '-(4-dimethylsilanephenyl) ethylene (DPE-SiH/OMe)). Both DPE-SiH and DPE-SiH/OMe were synthesized as monomers and then utilized to prepare corresponding oligomers with Si-C bonds and phenyl rings in their backbones. The DPs were calculated to be 5.9 and 6.3, respectively, while the beta-additions were 88.8 and 88.0%. The Td(5) of DPE-SiH and DPE-SiH/OMe oligomers were 270 and 345 degrees C, respectively, and their weight residue was approximately 20% even heated at a temperature near 1200 degrees C in nitrogen. The compact tiny pores distributed on cross section of the resultant SiC ceramics were observed with the scanning electron microscopy. The thermal analyses verified that the oligomers of DPE-SiH and DPE-SiH/OMe possessed favorable thermal stabilities and could be taken as the proper PCSs precursor for preparation of SiC ceramic materials.