Permethylated cyclolinear polysilanes and polyoxasilanes were synthesized by the reaction of 1,3 and 1,4 dichlorodecamethylcyclohexasilanes with metallic sodium (the Wurtz type reaction) and cis 1,3 dihydroxydecamethylcyclohexasilane (heterofunctional polycondensa tion reaction). Thermal and thermooxidative stability, as well as spectroscopic properties of the polymers obtained and products of their thermal decomposition were studied.
Isomer separation of mixtures, which were prepared by chlorination followed by transfor mations of dodecamethylcyclohexasilane (Me 2 Si) 6 into bifunctional decamethylcyclo hexasilanes X 2 Si 6 Me 10 (X = Cl, H, or OH), was carried out. As a result, mixtures of the corresponding 1,3 and 1,4 derivatives were separated to obtain structural isomers, and stere oisomers, viz., cis and trans 1,4 dihydrocyclohexasilanes, were isolated in individual form. The molecular and crystal structures of the resulting bifunctional decamethylcyclohexanes X 2 Si 6 Me 10 (X = H or OH) and decamethyl 7 oxahexasilanorbornane were established by X ray diffraction analysis. Bifunctional cyclohexasilanes form a mesophase as a plastic crystal. The temperature range of its existence was determined.
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