高橡胶含量苯乙烯-异戊二烯共聚物的反应挤出聚合  

Styrene-Isoprene Copolymers with High Rubber Contents Prepared by Reactive Extrusion

作　　者：曹华威[1] 袁协尧[1] 王继铭[1] 吴尚翰[1] 管涌[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：《功能高分子学报》2013年第1期1-7,共7页Journal of Functional Polymers

基　　金：国家自然科学基金(5093302);上海市重点学科建设项目(B502)

摘　　要：以正丁基锂(n-BuLi)为引发剂,苯乙烯(St)、异戊二烯(Ip)混合物为单体,十二烷基苯磺酸钠(SDBS)、四氢呋喃(THF)为极性调节剂,在双螺杆挤出机中,应用反应挤出技术实现了聚异戊二烯(PI)质量分数高达60%左右的苯乙烯-异戊二烯共聚物(S-I)的阴离子本体嵌段聚合。通过选择性氧化降解与GPC、1 H-NMR、DMA和TEM结合,分析了产物的分子链结构。结果显示,SDBS和THF的加入增加了PI的3,4-结构含量,且大大限制了St的聚合,使最长聚苯乙烯(PS)嵌段的分子量大为减小,同时很难包裹大的Ip气泡,共聚物的结构主要为S-I小嵌段,两组分相容性增强,无规化程度增加。Styrene-isoprene copolymers were synthesized through the anionic bulk polymerization in a corotating intermeshing twin-screw extruder. Sodium dodecyl benzene sulfonate and tetrahydrofuran were used as the polar regulators. The oxidative degradation method with hydrogen peroxide and osmium tetraoxide was used to cut off the double bonds of the polyisoprene in the copolymer chains. Based on GPC, ^1 H-NMR, DMA and TEM analysis, it was found that the copolymer chains were composed of a long polystyrene block and a lot of short styrene-isoprene blocks. While adding SDBS and THF into the polymerization system, 3,4-polyisoprene structure was greatly increased. Furthermore, the polymerization of styrene was significantly restrained and the molecular weight of the first long block of polystyrene was comparatively decreased, which could hardly wrap up big isoprene bubble. As a result, the produced copolymers were composed of the styrene-isoprene short blocks. The compatibility of two phases was enhanced and the randomization degree of the copolymer increased too.

关 键 词：反应挤出 苯乙烯 异戊二烯 阴离子聚合 共聚物结构 

分 类 号：O63[理学—高分子化学]