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Precursors for silicon carbide synthesised from dichloromethylsilane derivatives

journal contribution
posted on 14.09.2016 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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