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Stoichiometric silicon carbide from borate‐catalyzed polymethylsilane–polyvinylsilane formulations
Author(s) -
Boury Bruno,
Bryson Nathan,
Soula Gérard
Publication year - 1999
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/(sici)1099-0739(199906)13:6<419::aid-aoc855>3.0.co;2-8
Subject(s) - chemistry , stoichiometry , pyrolysis , catalysis , trimethylsilyl , boron , silicon carbide , ceramic , nuclear chemistry , yield (engineering) , thermal stability , polymer chemistry , infrared spectroscopy , inorganic chemistry , organic chemistry , metallurgy , materials science
Polymethylsilane (PMS) and polyvinysilane (PVS) were prepared by Wurtz condensation of chlorosilanes and characterized by spectroscopy ( 1 H, 13 C and 29 Si NMR, and infrared), viscosity and GPC analysis. Mixtures of the PMS and PVS were prepared and stabilized with 2,6‐di‐ t ‐butyl‐4‐methylphenol (BHT; 0.5 wt%) to which was added a catalytic amount of tris(trimethylsilyl)borate, B(OSiMe 3 ) 3 (BTMS; 2 wt% by weight). The resulting liquid materials were pyrolyzed to 950 °C and to 1400 °C under argon. The formulation, composed of 60% PMS / 40% PVS / 2% BTMS, was pyrolyzed and gives nearly stoichiometric silicon carbide in 73% yield. The pyrolyzate was analyzed spectroscopically at intermediate stages in order to study its thermal transformations and the influence of the boron catalyst. The ceramic obtained from the formulation 60% PMS / 40% PVS / 2% BTMS shows good stability at 1500 °C under oxygen. Copyright © 1999 John Wiley & Sons, Ltd.