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Precursors for silicon carbide synthesised from dichloromethylsilane derivatives

journal contribution
posted on 14.09.2016, 14:26 by Xujin Bao, Mohan J. Edirisinghe, Gerard F. Fernando, Michael J. Folkes
Several polysilanes, including two groups of copolymers and a group of ter-polymers, with overall functionalities ranging between 2 and 3 were prepared using the alkali metal dechlorination reaction. The yields of the soluble solid fractions of these polymers (the potential ceramic precursor) were in the range 40–70% wt and decreased with increasing overall functionalities in both cases of co- and terpolymers. The molecular weights and FT-IR spectra of the precursors have been determined and the ceramic in the residue after pyrolysis has been identified as silicon carbide. The pyrolytic yield can be increased by using a polymeric precursor of higher overall functionality. The reasons for this are discussed with reference to pyrolysis mechanisms. In particular, some of the ter-polymeric precursors synthesised with a high yield also give a high yield on pyrolysis due to the presence of branched structures and potential cross-linking sites.

Funding

The authors wish to thank the Soft Solids Initiative of EPSRC for funding this project (EPSRC Grant No. GR/L21976).

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Materials

Published in

Journal of the European Ceramic Society

Volume

18

Pages

915 - 922

Citation

BAO, X. ... et al., 1998. Precursors for silicon carbide synthesised from dichloromethylsilane derivatives. Journal of the European Ceramic Society, 18 (7), pp.915-922.

Publisher

© Elsevier

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

1998

Notes

Closed access.

ISSN

0955-2219

Language

en

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Keywords

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