异戊二烯-甲基丙烯酸甲酯的阴离子嵌段共聚合  

Anionic Block Copolymerization of Polyisoprene-b-Poly(methyl methacrylate) Copolymer

作　　者：吴洋[1] 陈波[1] 金芳芳[1] 李天一[1] 郑安呐[1] 管涌[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》2012年第4期387-392,共6页Journal of Functional Polymers

基　　金：国家自然科学基金项目(50933002);上海市重点学科和重点实验室项目(B502;08DZ2230500)

摘　　要：在四氢呋喃(THF)与环己烷的混合溶剂中,以正丁基锂(n-BuLi)为引发剂,采用具有较大空间位阻和特定电荷环境的P配合物为添加剂,实现了异戊二烯(Ip)和甲基丙烯酸甲酯(MMA)的阴离子嵌段共聚。分别采用GPC、1 H-NMR对聚合物的结构进行了分析表征。结果表明:随着THF与环己烷体积比的增大,单体的转化率呈现下降的趋势;同时空间位阻较大的P配合物的加入,堵塞了正、负离子对之间的部分通道,有效地抑制了MMA段聚合副反应的发生,在易于工业化的0℃之下成功合成了分子量分布窄(1.21)的聚异戊二烯-聚甲基丙烯酸甲酯嵌段共聚物(PI-b-PMMA),并且共聚物中PI嵌段以3,4结构链节为主。Polyisoprene-b-poly（methyl methacrylate）（PI-b-PMMA） was synthesized by anionic polymeri- zation using n-BuLi as the initiator in tetrahydrofuran-cyclohexane mixed solvent. P-complex with large steric hindrance and special electric charge environment was used as an additive in the system. The molecu- lar structure of prepared block copolymers was characterized by GPC and 1H-NMR. Results showed that the conversion decreased with the increasing of the volume ratio of tetrahydrofuran-cyclohexane. P-com- plex could inhibit the side reactions of MMA effectively, which can partially block the channels between positive and negative ions. Due to the introduction of P-complex, PI-b-PMMA with narrow molecular weight distribution（1.21） was synthesized successfully at 0℃ and easy to be industrialized. The PI chains in the copolymer were mainly composed of 3,4-structure.

关 键 词：阴离子聚合 甲基丙烯酸甲酯 异戊二烯 嵌段共聚物 

分 类 号：TQ316.32[化学工程—高聚物工业]