γ-Ray Curing of Poly(methylsilane) and Poly(methylsilane−dimethylsilane) for Improved Ceramic Yields

Poly(methylsilane) (PMS) and poly(methylsilane−dimethylsilane) copolymers (P(MS−DMS)) were synthesized by Wurtz type polycondensation reactions of methyldichlorosilane or methyldichlorosilane−dimethyldichlorosilane mixtures in toluene. The obtained polymers were sealed in Pyrex tubes under vacuum an...

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Bibliographic Details
Published in:Chemistry of materials 2000-09, Vol.12 (9), p.2686-2692
Main Authors: Narisawa, Masaki, Yoshida, Takeshi, Iseki, Takashi, Katase, Yoshiro, Okamura, Kiyohito, Oka, Kunio, Dohmaru, Takaaki
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Crosslinking and degradation
Exact sciences and technology
Miscellaneous
Physicochemistry of polymers
Polymers and radiations
Technical ceramics
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Summary:Poly(methylsilane) (PMS) and poly(methylsilane−dimethylsilane) copolymers (P(MS−DMS)) were synthesized by Wurtz type polycondensation reactions of methyldichlorosilane or methyldichlorosilane−dimethyldichlorosilane mixtures in toluene. The obtained polymers were sealed in Pyrex tubes under vacuum and cured with γ-rays. Hydrogen, methane, and silane gases formed in the tubes were analyzed by GC-MS spectroscopy. IR, UV, and NMR spectra of the cured precursor suggest the formation of Si−Si cross-links with small amounts of Si−CH2−Si bridges during irradiation. Ceramic yields of the cured polymers increased as the irradiation dose increased. The pyrolysis of the precursor polymers at 1473 K yielded amorphous products with an almost stoichiometric composition. The precise C/Si ratio in the pyrolysis product depended on the starting polymer composition and the curing conditions.
ISSN:0897-4756
1520-5002
DOI:10.1021/cm0002564