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Conversion of Polymers of Methyl- And Vinylsilane To SicCeramics

Published online by Cambridge University Press:  21 February 2011

Frances I. Hurwitz ,
Terrance A. Kacik ,
Xin-Ya Bu ,
John Masnovi ,
Paula J. Heimann  and
Kassahun Beyene
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 titanocenecatalyst, and their pyrolytic conversion to ceramics was followed using acombination of thermal analysis and infrared spectroscopy. The two polymershave distinctly different backbone structures, as determined by 29Si NMR; methylsilane polymerizes to a polysilane, whilevinylsilane polymers have a predominately polycarbosilane backbone, withsome polysilane structure as well. The pyrolysis path and char yield weredependent primarily on backbone structure, with little influence of polymermolecular weight. The majority of the weight loss on conversion occurs below650 °C, although bond rearrangement continues to 1400 °C. Poly(vinylsilane)produced a C-rich Si-C ceramic in which the carbon was dispersed on asufficiently fine level to show resistance to oxidation on heating in air to1400 °C.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 623
Copyright
Copyright © Materials Research Society 1998

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References

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