Title: THERMALLY CURABLE POLY(SILYLACETYLENE)SILOXANE AS POLYMERIC PRECURSOR OF SIC CERAMIC
Page Range: p.99-102
Author(s): Chengda Yu; Mingcun Wang; Pi Li
File size: 216K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 20
Issue No: No.1-2
Abstract
The pressureless pyrolysis of poly(silylacetylene)siloxane precursor to silicon carbide (SiC) was studied. Poly(silylacetylene)siloxane was synthesised via organometallic condensation. The precursor resin was well soluble in acetone, toluene and tetrahydrofuran (THF), etc. Thermal cure was conducted readily at 180-250 degrees C to form a hard brittle solid, and the cure mechanism was radical polymerisation of ethynyl groups. The ceramic yield of pyrolysis at 1500 degrees C was at about 67 wt.%. The molar ratio of Si/C in the SiC was found at 1:1.1-1:3 based on elements analysis. The results of x-ray diffraction (XRD) revealed the typical i-SiC structure in the poly(silylacetylene)siloxane derived ceramics. 8 Refs.
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