Synthesis, Self-Assembly, and Photoresponsive Behavior of Tadpole-Shaped Azobenzene Polymers

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• 作者：Xing Wang ; Yanyu Yang ; Peiyuan Gao ; Fei Yang ; Hong Shen ; Hongxia Guo ; Decheng Wu
• 刊名：ACS Macro Letters
• 出版年：2015
• 出版时间：December 15, 2015
• 年：2015
• 卷：4
• 期：12
• 页码：1321-1326
• 全文大小：474K
• ISSN：2161-1653

文摘

Herein, we report a feasible method to prepare a tadpole-shaped PEG-POSS-(Azo)₇ polymer. The polymer self-assembled into a large vesicle in aqueous solution, undergoing reversible smooth-curling transformation responsive to UV and dark conditions. Incorporating POSS units into the azopolymer furnished quick trans鈥?i>cis isomerization along a cubic orientation. The orientational isomerization formed some pores on the vesicular membrane and endowed the highly sensitive photoresponsive property. Encapsulation of various fluorescent dyes affected the hydrophilic/hydrophobic ratio of self-assemblies, causing their morphological transition from vesicles to micelles. Response to UV irradiation, the quick trans鈥?i>cis isomerization resulted in rapid release of the encapsulated dyes. The intriguing photoresponsive property renders this kind of tadpole-shaped POSS hybrid azopolymer a potential for application in controlled release of drug.