Synthesis of polysiloxane graft copolymers by hydrosilylation reactions

Polysiloxane‐poly(methyl methacrylate) and polysiloxane‐polystyrene graft copolymers of well‐defined structure and composition were synthesized by hydrosilylation. Polysiloxanes with SiH bonds were prepared by equilibrium ring‐opening polymerization of cyclic siloxane oligomers catalyzed by trifluoroacetic acid. Molecular weight and SiH group content were controlled by the feed ratio. Allyl‐terminated poly(methyl methacrylate) and polystyrene were prepared by the reaction of carboxyl‐terminated prepolymers with allyl glycidyl ether. The hydrosilylation reactions of SiH containing polysiloxanes with these allyl‐terminated polymers produced tailor‐made graft copolymers, which were characterized by their 1H NMR and IR spectra.