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Chemically Designed, UV Curable Polycarbosilane Polymers

Published online by Cambridge University Press:  25 February 2011

Kevin J. Thorne ,
Stephen E. Johnson ,
Haixing Zheng ,
John D. Mackenzie  and
M. F Hawthorne
Kevin J. Thorne
Affiliation:
UCLA Materials Science and Engineering Department, Los Angeles, CA, 90024.
Stephen E. Johnson
Affiliation:
UCLA Department of Chemistry and Biochemistry, Los Angeles, CA, 90024.
Haixing Zheng
Affiliation:
UCLA Materials Science and Engineering Department, Los Angeles, CA, 90024.
John D. Mackenzie
Affiliation:
UCLA Materials Science and Engineering Department, Los Angeles, CA, 90024.
M. F Hawthorne
Affiliation:
UCLA Department of Chemistry and Biochemistry, Los Angeles, CA, 90024.
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Abstract

To prepare new polycarbosilane polymer precursors with high solubility and the capability of UV cross-linking, commercial polycarbosilane was modified by a chemical route. These modifications involved AlCl3 catalyzed chlorination reactions of polycarbosilane's Si-H bonds. The resultant Si-Cl bonds were substituted by a reaction with sodium acetylyde to form Si-C=CH ligands. These ligands are suitable for controlled, free radical initiated cross-linking of the polycarbosilane polymers. The increase in molecular weight should allow for increased Tg's and the retention of polymer pre-forms. In this report, the chlorination of the polycarbosilane polymer and the substitution reactions of polycarbosilane were examined with IR, 29Si and 13C NMR spectroscopy. In addition, the retention of polymer pre-forms were analyzed after UV exposure and inert atmosphere pyrolysis.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 271: Symposium N – Better Ceramics Through Chemistry V , 1992 , 749
Copyright
Copyright © Materials Research Society 1992

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References

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