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Hydropolysilanes as precursors to silicon carbide
Author(s) -
Shieh YeongTarng,
Sawan Samuel P.
Publication year - 1995
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.1995.070581112
Subject(s) - pyrolytic carbon , pyrolysis , monomer , polymer , thermogravimetry , materials science , carbide , chemical engineering , silicon carbide , ceramic , polymer chemistry , polymerization , infrared spectroscopy , chemistry , organic chemistry , composite material , engineering
A systematic study of the roles of three different types of monomers and their compositions in hydropolysilane homo‐, co‐, and terpolymers on their pyrolytic yields to silicon carbides was performed. The diorganodichlorosilane monomer, serving to increase molecular weights of the polymers, is not a significant factor in pyrolytic yields. The organotrichlorosilane monomer, leading to branched structures of the polymers, is helpful in obtaining high pyrolytic yields. The monoorganodichlorosilane monomer, providing crosslinking sites for the polymers, is useful in retarding decomposition during pyrolysis. The precursor‐to‐ceramic conversion chemistry was studied using thermogravimetry, infrared spectroscopy, X‐ray powder diffraction, and Rutherford backscattering spectrometry. The pyrolytic yields were not pyrolysis‐time‐dependent but decreased as the pyrolysis temperature increased. The apparent crystalline size increased as both the pyrolysis time and temperature increased. For a 30 min pyrolysis, the pyrolysis temperature must be over 1000–1200°C to provide a crystalline pyrolytic residue. © 1995 John Wiley & Sons, Inc.