Styrene-butadiene block copolymer with high cis-1,4 content

摘要

Copolymerization of butadiene (Bd) and styrene (St) was carried out by a rare earth catalyst system. The microstructure, composition, and morphology of the copolymer were characterized by FTIR, ~1H-NMR, ~(13)C-NMR spectroscopy and TEM. The molecular weight (MW), molecular weight distribution (MWD) and composition distribution of the copolymer were determined by GPC with RI and UV detectors. The results show that the copolymer is a block copolymer of butadiene and styrene with high cis-1,4 content. The cis-1,4 content of butadiene unit is 97.0%(mole), styrene content in the copolymer is 21.8%(mole). The phase-separated morphology is formed by polybutadiene (PB) and polystyrene (PS) sequences.