采用反应挤出三次加料法合成苯乙烯/异戊二烯/苯乙烯  

Preparation of Styrene-isoprene-styrene Thermoplastic Elastomer by Three Times Feeding Method of Reactive Extrusion

作　　者：单东[1] 杨龙[1] 王继铭[1] 郑安呐[1] 

机构地区：[1]华东理工大学材料科学与工程学院,上海市先进聚合物材料重点实验室,超细材料制备与应用教育部重点实验室,上海200237

出　　处：《高等学校化学学报》2014年第12期2698-2705,共8页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:50933002);国家'八六三'计划项目(批准号:2012AA040306)资助~~

摘　　要：以同向啮合双螺杆挤出机为反应器,采用苯乙烯和异戊二烯为聚合单体,以正丁基锂为引发剂,采用三次加料法合成苯乙烯/异戊二烯/苯乙烯(SIS)三嵌段热塑性弹性体.氢核磁共振(1H NMR)谱分析结果表明,共聚物中聚异戊二烯嵌段以1,4-结构为主.采用四氧化锇催化双氧水氧化降解聚合物分子链,利用凝胶渗透色谱对氧化降解后的聚苯乙烯碎片进行分析,证明共聚物分子为(聚苯乙烯-聚异戊二烯-聚苯乙烯)(PS-PI-PS)三嵌段结构.动态力学分析(DMA)及透射电子显微镜(TEM)分析结果表明,SIS具有两相分离结构.拉伸试验结果表明,共聚物拉伸强度与苯乙烯含量有关.Styrene/isoprene/styrene （ SIS ） triblock thermoplastic elastomer was polymerized by three times feeding method using a co-rotating intermeshing twin screw extruder as the reactor and n-butyllithium as the initiator. 1 H NMR spectra show that the polyisoprene block of the copolymer is mainly composed of 1,4-polyi-soprene structure. The molecule chains of the copolymers were degraded using hydrogen peroxide catalyzed by osmium tetroxide, the segments of polystyrene after oxidization were characterized by gel permeation chroma-tography（ GPC） cooperating with the multi-angle laser light scattering（ MALLS） instrument. It was found that the copolymers consisted of polystyrene-polyisoprene-polystyrene（ PS-PI-PS） three blocks. Cooperated with the survey of dynamic mechanical analysis（DMA） and transmission electron microscope（TEM） photographs, it was confirmed that styrene/isoprene/styrene（ SIS） had two phase separation structure. Tensile testing showed the relationship between tensile strength of the copolymer with styrene content.

关 键 词：阴离子聚合 反应挤出 三次加料法 热塑性弹性体 苯乙烯/异戊二烯/苯乙烯三嵌段共聚物 

分 类 号：O632.1[理学—高分子化学]