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Photo‐regulated phase transition of poly(ethylene glycol) derivative containing azobenzene group
Author(s) -
Hu Jie,
Wang Xiang,
Zheng Shiheng
Publication year - 2012
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.3033
Subject(s) - photoisomerization , azobenzene , ethylene glycol , materials science , derivative (finance) , kinetics , phase transition , photochemistry , irradiation , phase (matter) , polymer chemistry , isomerization , organic chemistry , chemistry , thermodynamics , catalysis , polymer , physics , composite material , quantum mechanics , nuclear physics , financial economics , economics
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 ( k t and k c ) 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.