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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

1. Laine, R. M., Blum, Y. D., Tse, D., and Glaser, R., in Inorganic and Organometallic Polymers, ACS Symposium Series 360, edited by Zeldin, M., Wynne, K. J., and Allcock, H. R. (ACS, Washington, DC, 1988), p. 124.Google Scholar
2. (a) Blum, Y. D. and Laine, R. M., Organomet. 5, 2081 (1986);Google Scholar
(b) Laine, R. M. and Blum, Y. D., U.S. Patent No. 4, 383 (Sept. 1986);Google Scholar
(c) Blum, Y. D., Laine, R. M., Schwartz, Y. D., Rowcliffe, D. J., Bening, R. C., and Cotts, D. C., in Better Ceramics Through Chemistry II, Mat. Res. Soc. Symp. Proc, Vol. 73, edited by Brinker, C. J., Clark, D. E., and Ulrich, D. R. (Materials Research Society, 1986), p. 389;Google Scholar
(d) Schwartz, K. B., Rowcliffe, D. J., Blum, Y. D., and Laine, R. M., in Better Ceramics Through Chemistry II, Mat. Res. Soc. Symp. Proc, Vol. 73, edited by Brinker, C. J., Clark, D. E., and Ulrich, D. R. (Materials Research Society, 1986), p. 389; p. 407;Google Scholar
(e) Chow, A. W., Hamlin, R. D., Blum, Y. D., and Laine, R. M., J. Pol. Sci.: Part C: Pol. Lett., 26, 103 (1988).Google Scholar
3. (a) Laine, R. M., Blum, Y. D., Hamlin, R. D., and Chow, A., in Ultrastructure Processing of Glass, Ceramics and Composites III, edited by Mackenzie, D. D. and Ulrich, D. R., (J.Wiley and Sons Inc., (in press);Google Scholar
(b) Biran, C., Blum, Y. D., Glaser, R., Tse, D., Youngdahl, K. A., and Laine, R. M., submitted to J. Mol. Catal. (1988).Google Scholar
4. (a) Schwartz, K. B., Rowcliffe, D. J., and Blum, Y. D., Comm. Am. Cer. Soc, in press;Google Scholar
(b) Lenhart, S. J., Blum, Y. D., and Laine, R. M., submitted to J. Corrosion.Google Scholar
5. Seyferth, D. and Wiseman, G. H., Am. Chem. Soc, Polymer Div. Polym. Prprt. 25 (1984), p. 10.Google Scholar
6. Blum, Y. D., Schwartz, K. B., and Laine, R. M., submitted to J. Mat. Sci.Google Scholar
7. Arai, M., Isoda, T., and Funayama, O., U.S Patent No. 4, 659, 850 (21 April 1987).Google Scholar
8. Matsutomo, M., Niwada, K., and Tanaka, S., Japan Patent No. 61 72, 607 (14 April 1986).Google Scholar
9. (a) Seyferth, D. and Wiseman, G. H., U.S. Patent No. 4,482,669Google Scholar
(b) Seyferth, D., Wiseman, G. H., Schwark, J. M., Yu, Y. F., and Charles, C. A., U.S. Patent No. 4,482,669 [1], p. 143.Google Scholar