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Synthesis of silicon carbide from polysilanes: effect of hydrosilane and vinyl groups

Bao, X; Edirisinghe, MJ; Fernando, GF; Folkes, MJ; (1998) Synthesis of silicon carbide from polysilanes: effect of hydrosilane and vinyl groups. BRIT CERAM T , 97 (6) 253 - 258.

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Abstract

Several chlorosilane monomers were used to synthesise 18 different co- and ter-polysilanes. The soluble solid fraction of these polymers,which are potential precursors for ceramics, has been characterised by gel permeation chromatography ann Fourier transform-infrared spectroscopy. The ter-polymer precursors, some of which can be synthesised with high yields (70 wt-%), soften below 100 degrees C and can be melt processed. The precursors have been pyrolysed in nitrogen to 900 degrees C to determine the ceramic yield which was dependent on the composition of each polysilane. Further hearing to over 1100 degrees C produced crystalline silicon carbide. Possible reaction mechanisms involved in the pyrolysis process are presented. Some of the terpolymer precursors synthesised with high yields also gave silicon carbide yields close to the maximum theoretical values obtainable. BCT/314.

Type: Article
Title: Synthesis of silicon carbide from polysilanes: effect of hydrosilane and vinyl groups
Keywords: PRECURSORS, POLYMERS, FIBERS, PYROLYSIS, CERAMICS
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/105885
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