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Conversion of Polymers of Methyl- And Vinylsilane To Sic Ceramics

Published online by Cambridge University Press:  21 February 2011

Frances I. Hurwitz
Affiliation:
NASA Lewis Research Center, Cleveland, OH 44135
Terrance A. Kacik
Affiliation:
Cleveland State University, Cleveland, OH 44115
Xin-Ya Bu
Affiliation:
Cleveland State University, Cleveland, OH 44115
John Masnovi
Affiliation:
Cleveland State University, Cleveland, OH 44115
Paula J. Heimann
Affiliation:
Cleveland State University, Cleveland, OH 44115
Kassahun Beyene
Affiliation:
Cleveland State University, Cleveland, OH 44115
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Abstract

Poly(methylsilane) and poly(vinylsilane) were synthesized using a titanocene catalyst, and their pyrolytic conversion to ceramics was followed using a combination of thermal analysis and infrared spectroscopy. The two polymers have distinctly different backbone structures, as determined by 29Si NMR; methylsilane polymerizes to a polysilane, while vinylsilane polymers have a predominately polycarbosilane backbone, with some polysilane structure as well. The pyrolysis path and char yield were dependent primarily on backbone structure, with little influence of polymer molecular weight. The majority of the weight loss on conversion occurs below 650 °C, although bond rearrangement continues to 1400 °C. Poly(vinylsilane) produced a C-rich Si-C ceramic in which the carbon was dispersed on a sufficiently fine level to show resistance to oxidation on heating in air to 1400 °C.

Type
Research Article
Copyright
Copyright © Materials Research Society 1998

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References

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