Synthesis of poly(styrene-b-dimethylsiloxane) multi-block copolymers via polyhydrosilylation reaction

Poly(styrene-b-siloxane) multi-block copolymers have been prepared by polyhydrosilylation reaction. Four copolymers have been synthesized by the reaction of α,ω-bis silane polydimethylsiloxanes with α,ω-bis allyl polystyrene. The latter has been obtained by the reaction of carboxy-telechelic polystyrene with allyl glycidyl ether. 1H NMR and FT-IR analyses show that the polyhydrosilylation reaction is quantitative. The copolymer molecular weights were determined by SEC to be about 25,000 g/mol. The properties of these copolymers were characterized by DSC and DMA analyses. The rubbery plateaus of these copolymers are in the range of −115 °C to 85 °C.