A Novel Styrene-Butadiene Block Copolymer and its Applications
The butadiene-styrene block copolymers (BS) consisting of soft segment of polybutadiene (PB) with high cis-1,4 content and some crystalline segments of polystyrene (PS) could be prepared by using a rare earth catalyst system. The molecular weight (MW) and its distribution (MWD) of the copolymers were determined by GPC with RI and UV detectors. The microstrueture, composition and morphology of the copolymers were characterized by FTIR, 1H-NMR, 13C-NMR spectroscopy, TEM and AFM photography. The GPC results of RI and UV curves reflect the existence of PS segments in eopolymers. It is demonstrated from diagnostic absorption in FTIR and resonance in 1H-NMR, 13C-NMR spectra that butadiene (Bd) units in the copolymer are primarily cis-1,4 configuration. The contents of cis-1,4 and styrene (St) units in the eopolymers are determined to be≥97％ (mol)and 16～29％ (mol) respectively. Small fraction of vinyl and trans-1,4 of Bd units occationally distributed among the polymer chain. TEM micrograph indicates that St homosequence agglomerated and phase-separated morphology of PS domains ranging from 25nm to 50nm tethered by the elastomeric PB segments formed. The PS-b-cis-PB copolymer could be used as an effective compatilizer for binary PS/cis-PB blend and an effective modifier for cis-PB or PS to improve their mechanical property.
Han ZHU Yi-Xian WU Jiang-Wei ZHAO Qing-Lei GUO Qi-Gu HUANG Guan-Ying WU
Beijing University of Chemical Technology,State Key Laboratory of Chemical Resource Engineering,Beijing 100029,China
国际会议
5th International Symposium on High-Tech Polymer Materials(HTPM-V)(第五届国际高技术高分子材料学术会议)
北京
英文
91
2008-10-27（万方平台首次上网日期，不代表论文的发表时间）