SYNTHESIS OF SOLUBLE COPOLYMERS OF OLIGOORGANOVINYLSILOXANE WITH METHYL ACRYLATE AND STYRENE

For radical copolymerization in solution of oligoorganovinylsiloxane (with number-average functionality fBARn = 2.2) with methyl acrylate and styrene there exist regions of initial concentrations of comonomers solutions where the reaction proceeds only with formation of soluble polyfunctional copolymers. The absence of homopolymers impurity is confirmed by turbidimetric titration and fractionation of copolymerization products. The study of copolymerization in solutions of the limiting concentration of comonomers by GPC and viscometry methods shows that the most essential structural changes related with the formation of branched macromolecules proceed after 50% of conversion. Synthesized soluble copolymers containing free double bonds are shown to be capable to curing in a film in air under the action of peroxides.