通过大分子单体的“点击”反应合成超支化聚苯乙烯  

Hyperbranched Polystyrene via Click Reaction of AB_2 Macromonomer

作　　者：孔立智[1,2] 孙淼[2] 潘才元[2] 

机构地区：[1]江苏工业学院,常州213164 [2]中国科学技术大学,合肥230026

出　　处：《高分子通报》2010年第6期71-74,共4页Polymer Bulletin

基　　金：国家自然科学基金(50673086和50633010);江苏省自然科学基金(BK2009533)

摘　　要：用一端带有一个叠氮基,另一端带有两个炔基的聚苯乙烯(PSt)大分子单体,通过"点击"化学反应,成功制备了结构规整的超支化聚苯乙烯。首先,L-天冬氨酸经过溴化和酯化两步反应得到含有两个炔基的原子转移自由基聚合(ATRP)引发剂——2-溴代琥珀酸双炔丙基酯(BPBS),然后引发苯乙烯的ATRP,并通过NaN3的取代反应把末端溴转化为叠氮基,得到AB2型大分子单体(CH≡C)2-PS-N3。这种大分子单体通过"点击"反应聚合得到超支化聚苯乙烯,根据多角度激光光散射(MALLS)测试结果,最终产物重均聚合度DPw可达53,分子量分布Mw/Mn=1.53。Well-defined hyperbranched polystyrenes have been successfully prepared by polymerization of AB_2 macromonomer,polystyrene containing an azide group at its one end and two terminal propargyl groups at the other end via click reaction.At first an ATRP initiator,bispropargyl 2-bromosuccinate（BPgBS） with two propargyl groups and one bromine group was synthesized by the successive bromination and esterification reaction of L-aspartic acid.The AB_2 macromonomer,（CH≡C）_2-PS-N_3 were obtained via ATRP of St using BPgBS as initiator,and subsequently,the terminal bromine groups of（CH≡C）_2-PS-Brs were substituted by N_3 via the reaction with sodium azide.The resultant polymers were characterized by GPC,~1H NMR and MALLS methods.The final ＂HyperMacs＂ have high molecular weight up to M_（w,MALLS） = 210 000 g/mol and narrow molecular weight distributions（M_w/M_n= 1.53）.

关 键 词：点击反应 大分子单体 超支化聚合物 

分 类 号：TQ325.2[化学工程—合成树脂塑料工业]