Photo-regulated phase transition of poly(ethylene glycol) derivative containing azobenzene group

Authors


J. Hu, School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China.

E-mail: hujiechem@hotmail.com

Abstract

A photo-responsive and thermo-responsive poly(ethylene glycol) derivative containing azobenzene group was synthesized. Its photoisomerization kinetics was investigated by the UV–vis spectra, and the pseudo-first-order rate constants (kt and kc) were determined to be 1.5 × 10−2 and 9.3 × 10−2 s−1, respectively. It is found that the phase transition behavior can be tuned theoretically through photoirradiation between 26.6°C and 36.7°C. Finally, it is worthy to note that the changes of the lower critical solution temperature occur repeatedly upon successive irradiation of UV and visible light. Copyright © 2012 John Wiley & Sons, Ltd.

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