Thermal transformations of unsaturated poly(silicohydrocarbons)

Thermolysis of poly(dimethylsilethyne) and poly(dimethylsilethenesiiethy ne ) was studied at temperatures up to 1700 degreesC by the methods of IR and Raman spectroscopy, high-resolution solid-state C-13 NMR spectroscopy, scan ning electron microscopy, and thermogravimetric analysis. A continuous evol ution of the thermolysis products includes, first, the formation of a silic on carbide phase, crystallization, and beta-alpha transition, and, second, the formation of condensed aromatic structures at the initial stages. the c onsumption of these groups to accomplish the formation of silicon carbide, and the ordering and subsequent crystallization of carbon phases.