设计合成了具有光响应性的A_2BA_2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 A_2BA_2-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.
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