Synthesis of syndiotactic polystyrene—Polyisobutylene graft copolymers by cationic half‐sandwich scandium complex

Abstract

Syndiotactic polystyrene is a high strength engineering plastic, and polyisobutylene is an excellent elastomers. In order to combine the advantages of syndiotactic polystyrene and polyisobutylene, isobutylene was achieved to graft onto the crystalline syndiotactic polystyrene, forming graft copolymers, under half sandwich scandium complex [(C 5 Me 4 SiMe 3 )Sc(CH 2 SiMe 3 ) 2 THF]/[Ph 3 C] [B(C 6 F 5 ) 4 ] after the application of syndiotactic copolymers of styrene and 4-isopropenylstyrene with pendant double bonds. Grafted copolymers based on crystalline polystyrene and rubbery polyisobutylene block have both high T m (270 C) and low T g (À67 C), meanwhile, these materials have relative good mechanical properties.