Cyclolinear Copolymers with Biscyclic Fragments in the Side Chain

The reaction of heterofunctional condensation of hydroxymethyl(phenyl)cyclosiloxanes with tetrachlorosilane in the ratio 2:1 of initial products has been studied in the presence of pyridine and bis(heptamethylcyclotetrasiloxy)dichlorosilane and bis(pentaphenylcy-clotrisiloxy)dichlorosilane were obtained. The reaction of heterofunctional condensation of bis(organocyclosiloxy)dichlorosilanes with αω-dihydroxydimethylsiloxanes in the presence of pyridine was investigated. It was shown that at small lenghts of the linear dimethylsiloxane links, the reaction of heterofunctional condensation runs both intermolecularly with formation of polymers and intramolecularly with formation of tricycloorganosiloxanes. It was established, that the insertion of bis organocyclosiloxy fragments in the side chain hinders the chain transfer reactions that proceed with release of the D-type cycles during thermal depolymerization. Thermogravimetric, thermo-mechanical and X-ray studies of synthesized copolymers were carried out.