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Precursors for silicon carbide synthesised from dichloromethylsilane derivatives
journal contribution
posted on 2016-09-14, 14:26 authored by Xujin BaoXujin Bao, Mohan J. Edirisinghe, Gerard F. Fernando, Michael J. FolkesSeveral 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 SocietyVolume
18Pages
915 - 922Citation
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
© ElsevierVersion
- 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
1998Notes
Closed access.ISSN
0955-2219Publisher version
Language
- en