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New Structures of Preceramic Polysilazanes Synthesized by Transition Metal Catalysis

Published online by Cambridge University Press:  25 February 2011

Yigal D. Blum ,
Kenneth B. Schwartz ,
Edward J. Crawford  and
Richard D. Hamlin
Yigal D. Blum
Affiliation:
SRI International, 333 Ravenswood Ave., Menlo Park, CA 94025
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Abstract

Further capability of silazane dehydrocoupling polymerization catalyzed by ruthenium carbonyl (20–200 ppm) is demonstrated in a series of reactions. Ammonia and monomethylamine are used as reactants to bridge oligomers and polymers containing Si-H bonds to provide higher molecular weight polymers with higher latent reactivity and to increase the ceramic yields and the nitrogen-to-carbon ratio in the final ceramic compositions. New types of tractable polymers containing cyclomers having [MeSiHNH] units with molecular weights over 2000 d are formed. Various polymeric properties (e.g., viscosities, softening and melting points) and ceramic yields up to 80–85 wt% are obtained by controlling the catalytic reaction conditions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 121: Symposium H – Better Ceramics Through Chemistry III , 1988 , 565
Copyright
Copyright © Materials Research Society 1988

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References

REFERENCES

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