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Single‐Step Synthesis of Chemically Cross‐Linked Polysilastyrene and Its Conversion to β‐Silicon Carbide
Author(s) -
Krishnan Venkatasubbaiah,
Bindu Ravindranathan,
Chandrasekhar Vadapalli,
Murthy Varanasi S. R.
Publication year - 2002
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2002.tb00123.x
Subject(s) - divinylbenzene , alkali metal , nanocrystalline material , materials science , silicon carbide , polymerization , pyrolysis , chemical engineering , polymer , polymer chemistry , organic chemistry , chemistry , nanotechnology , copolymer , styrene , composite material , engineering
A new method for chemically cross‐linking polysilastyrene using divinylbenzene as the cross‐linking agent is reported. The procedure involves a single‐step synthesis using the alkali‐metal sodium to promote the polymerization of dimethyldichlorsilane in the presence of the comonomers phenylmethyldichlorosilane and divinylbenzene. The cross‐linked polymer can be readily converted to β‐SiC on pyrolysis at 1500°C. The β‐SiC obtained by this procedure is nanocrystalline and has a grain‐size distribution of 8–20 nm.