中文摘要：

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。

英文摘要：

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.