Graft copolymerization of 3-(trimethoxysilyl) propyl methacrylate onto styrene–butadiene–styrene triblock copolymer

Abstract

Graft copolymerization of silicone monomer—3-(trimethoxysilyl) propyl methacrylate (TMSPMA) grafted onto styrene–butadiene–styrene (SBS; SBS-g-TMSPMA) triblock copolymer was carried out by free radical polymerization, and the improvement of adhesive property of the grafted SBS for glass materials is the major purpose of this study. To gain the optimal reaction conditions and grafting effect, the effect of various factors, such as the monomer ratio and reaction time, on the grafting ratio and grafting efficiency (GE) of SBS-g-TMSPMA graft copolymers were investigated. In addition, various SBS-g-TMSPMA graft copolymers were coated on different substrates based on glass and their tensile strengths that were tested. The optimal graft condition for the SBS-g-TMSPMA was obtained when the molar ratio of TMSPMA to SBS was 1 and reaction time was 4 h. Their grafting ratio and GEreached to a maximum of 56.8% and 60.2%, respectively, and the tensile strength also reached maximum. In this article, we confirm that the higher the grafting ratio, the more the silicone-containing in the graft copolymer. Hence, the –Si–O–Si– bonding between SBS-g-TMSPMA and glass substrate was more intensive and tensile strength was stronger.