苯乙烯-丁二烯-甲基丙烯酸甲酯三嵌段共聚物的阴离子聚合及其表征

以正丁基锂为引发剂, 1 ,1-二苯基乙烯为戴帽剂, 2-(2-甲氧基乙氧基)乙氧基锂为络合剂, 在环己烷、四氢呋喃混合溶剂中, 采用阴离子聚合法, 于－70℃～－40℃合成了非极性-极性的三嵌段共聚物聚苯乙烯-聚丁二烯-聚甲基丙烯酸甲酯(S-B-MMA) ,并借用GPC、¹H-NMR、DSC、TEM、IR等仪器对共聚物进行了表征。结果表明, 所得产物具备较窄的分子量分布 (Mw/Mn<1.3) 及微观相分离结构。

Study on systhesis and characterization of tri-block copolymer styrene-butzdiene-methyl methacrylate by anionic polymerization

This article reports a new kind of copolymer, non polar polar terpolymer : poly(styrene-butadiene-methyl methacrylate ) (P(S-b-B-b-MMA)) prepared by anionic polymerization with n BuLi as initiator, 1,1 diphenylethylene (DPE) as capping agent and lithium 2-(-methoxyethoxy) ethoxide (LiOEEM) as complex agent. The polymerization was in a combined solution of cyclohexane and tetrahydrofuran(THF). The temperature of the polymerization ranged from -70 ℃ to -40 ℃. The st ructure morphology properties were studied through GPC, ¹H-NMR ,DSC ,TEM and IR. The result s indicated that the copolymer P(S-B-MMA) has narrow molecular weight dist ribution (MWD < 113) and the character of microphase2separation.