Polydiorganosiloxane-polyphenylsilsesquioxane Block Copolymers Bearing Various Si-substituents: Synthesis, Properties

Block copolymers have been synthesized from dihydroxyl-terminated polydiorganolsiloxane oligomers bearing various Si-substituents and polyphenylsilsesquioxane oligomers. The products are soluble, amorphous and display excellent thermal properties in comparison with the linear polydiorganolsiloxane analogues. The structure, molecular weight and thermal stability properties of these silicone block copolymers were investigated. Overall, the aim of studies is to obtain polymer material with high molecular weight and thermal stability, thus further improving its application value.