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A new SiC precursor with high ceramic yield: Synthesis and characterization of CH x MeSiH 2 ‐containing poly(methylsilane‐carbosilane)
Author(s) -
Wang Xinliang,
Chen Yi,
Li Yongming,
Xu Caihong
Publication year - 2019
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.47618
Subject(s) - ceramic , yield (engineering) , comonomer , materials science , copolymer , reagent , pyrolysis , polymer chemistry , nuclear chemistry , chemical engineering , organic chemistry , chemistry , composite material , polymer , engineering
A new poly(methylsilane‐carbosilane) (PMSCS) for silicon carbide precursor was prepared using Wurtz‐type copolymerization of methyldichlorosilane (MeHSiCl 2 ), chloromethyldichloromethylsilane (ClCH 2 MeSiCl 2 ), and (dichloromethyl)methylsilane (Cl 2 CHMeSiH 2 ), with (chloromethyl)methylsilane (ClCH 2 MeSiH 2 ) or trimethylchlorosilane (Me 3 SiCl) as terminated reagent. The ceramic yield of PMSCS was markedly increased by introduction of Cl 2 CHMeSiH 2 comonomer and capped with ClCH 2 MeSiH 2 . The H 2 MeSiCH 2 ‐capped PMSCS with CHMeSiH 2 structure unit in main chain produced SiC ceramic with 1.21 of C/Si atomic ratio in a ceramic yield of 78 wt % upon pyrolyzed at 1000 °C. The excellent pyrolytic properties, combining with its economical preparation, good storage stability in air, and favorable processabilty, make the CH x MeSiH 2 ‐containing PMSCS a new cost‐effective SiC ceramic precursor. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47618.