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Precursors for silicon carbide synthesised from dichloromethylsilane derivatives

Bao, XJ; Edirisinghe, MJ; Fernando, GF; Folkes, MJ; (1998) Precursors for silicon carbide synthesised from dichloromethylsilane derivatives. J EUR CERAM SOC , 18 (7) 915 - 922.

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Abstract

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 sires. (C) 1998 Elsevier Science Limited. All rights reserved.

Type: Article
Title: Precursors for silicon carbide synthesised from dichloromethylsilane derivatives
Keywords: ORGANOSILANE POLYMERS, PYROLYSIS, FIBERS, UNITS
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: http://discovery.ucl.ac.uk/id/eprint/105876
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