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Synthesis and properties of liquid polycarbosilanes with hyperbranched structures
Author(s) -
Huang Muhe,
Fang Yunhui,
Li Ran,
Huang Tianhua,
Yu Zhaoju,
Xia Haiping
Publication year - 2009
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.30071
Subject(s) - materials science , yield (engineering) , fourier transform infrared spectroscopy , polymer , chemical engineering , ceramic , gel permeation chromatography , polymer chemistry , permeation , composite material , chemistry , membrane , biochemistry , engineering
Liquid polycarbosilanes substituted by unsaturated groups were prepared by a one‐pot synthesis with Cl 2 Si(CH 3 )CH 2 Cl, Cl 3 SiCH 2 Cl, and CH 2 CHCH 2 Cl (or HCCMgBr) as the starting materials. The as‐received polycarbosilanes were characterized by gel permeation chromatography, Fourier transform infrared spectroscopy, and nuclear magnetic resonance and were confirmed to have hyperbranched structures. The polymer yield, SiH content, side reaction, unsaturated group content, and polymer structure are affected by the amount of the starting materials in feed. The thermal properties of the polycarbosilanes were investigated by thermogarvimetric analysis. The ceramic yield of allyhydridopolycarbosilane is about 60% and that of ethynylhydridopolycarbosilane is over 75%, indicating that the liquid polycarbosilanes have great potential to be promising precursors to SiC. Moreover, the compositions of the polycarbosilanes and the final ceramics can be tailored by controlling the amount of the starting materials. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009