ORGANOSILICON POLYCYCLIC COPOLYMERS OF BEAD-LIKE STRUCTURE

Catalytic dehydrocondensation of dihydroorganocyclotetra(hexa)siloxane s with dihydroxyorganocyclotetra(hexa)siloxanes in the presence of pla tinochlorohydric acid on anhydrous powder-like caustic potassium has b een studied. High-molecular weight organosilicon polycyclic copolymers with bead-like structure having coclotetra- and cyclohexasiloxane fra gments in the chain and completely insoluble in organic solvents were synthesized. Reaction order, activation energies and dehydrocondensati on rate constants were found. Thermogravimetric, thermomechanical and X-ray studies of the synthesized polymers were carried out.