光响应性A_2BA_2型两亲嵌段共聚物的合成与表征  

Synthesis and Characterization of Photo-Responsive A_2BA_2-Type Amphiphilic Block Copolymer

作　　者：唐新德[1] 韩念凤[1] 周德杰[1] 

机构地区：[1]山东交通学院新材料研究所,山东济南250023

出　　处：《高分子材料科学与工程》2009年第12期31-33,37,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(20134020);山东省教育厅科技计划项目(J05D11)

摘　　要：设计合成了具有光响应性的A2BA2型两亲嵌段共聚物。聚乙二醇(PEG600)与2,2-二氯乙酰氯通过酯化反应制备结构对称的四官能团大分子引发剂,引发偶氮苯单体6-[4-(4-乙氧基苯基偶氮)酚氧基]己基甲基丙烯酸酯(AZO6Et)的原子转移自由基聚合(ATRP)反应。利用凝胶色谱(GPC)与核磁共振氢谱(1H-NMR)表征了产物的分子量与结构组成,利用差示扫描量热法(DSC)与偏光显微镜(POM)对聚合物的热行为及液晶性进行了表征。在紫外/可见光照射下聚合物溶液呈现明显的光响应性。Photo-responsive A2BA2-type amphiphilic block copolymer containing azobenzene was designed and synthesized.Macroinitiator prepared by the esterification between poly（ethylene oxide）（PEG） and 2,2-dichloroacetyl chloride was utilized to initiate the atom transfer radical polymerization（ATRP） of 6-[4-（4-ethoxyphenylazo）phenoxy]hexyl methacrylate（AZO6Et）.The resulting macroinitiator and the block copolymer were characterized by 1H-NMR,gel permeation chromatography（GPC）.Differential scanning calorimeter（DSC） and polarizing optical microscopy（POM） were performed to reveal its thermal behaviors and liquid crystalline property.The solution of the block copolymer exhibits photoresponsive under UV/vis irradiation.The block copolymer shows nematic phase,which is promising in some areas,such as optical data storage,optical switch,and molecular devices.

关 键 词：光响应性 A2BA2型 两亲嵌段共聚物 液晶性 原子转移自由基聚合 

分 类 号：TQ316.344[化学工程—高聚物工业]