Cyclic Amphiphilic Random Copolymers Bearing Azobenzene Side Chains: Facile Synthesis and Topological Effects on Self-Assembly and Photoisomerization

Ye Cai, Jinjie Lu, Feng Zhou, Xiaoji Zhou, Nianchen Zhou*(周年琛), Zhengbiao Zhang*（张正彪） and Xiulin Zhu*（朱秀林）

Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, P. R. China

Macromol. Rapid Commun. 2014, 35, 901–907.

In this article, well-defined cyclic amphiphilic random copolymers bearing azobenzene side chains and pendent carboxyl moieties, cyclic-P(BHMEm-co-AAn)s, are synthesized by combining atom transfer radical polymerization (ATRP) with Cu(I)-catalyzed azide/alkyne cycloaddition (CuAAC) “click” reaction and selective hydrolysis of tert-butyl ester. Successful synthesis of the cyclic-P(BHMEm-co-AAn)s is fully characterized and verified via conventional gel permeation chromatography, triple detection gel permeation chromatography, nuclear magnetic resonance, Fourier transform infrared, and matrix-assisted laser desorption ionization–time-of-flight mass spectrometry. The cyclic topology induces profound effects on the glass transition temperatures, self-assembly behavior, and photoresponsive performance of the copolymers compared with their linear counterparts.

链接：

http://onlinelibrary.wiley.com/doi/10.1002/marc.201300913/abstract