Physicochemical Characterization of a Photoinduced Sol–Gel Transition of an Azobenzene-Containing ABA Triblock Copolymer/Ionic Liquid System
作者： Xiaofeng Ma , Ryoji Usui , Yuzo Kitazawa , Ryota Tamate , Hisashi Kokubo
DOI: 10.1021/ACS.MACROMOL.7B01538
关键词: Azobenzene 、 Polymer chemistry 、 Ionic liquid 、 Glass transition 、 Photoisomerization 、 Methacrylate 、 Ethylene oxide 、 Sol-gel 、 Materials science 、 Chemical engineering 、 Copolymer
摘要: We have previously reported that an ABA triblock copolymer with poly(ethylene oxide) as the B block and a thermo-/photoresponsive random of 4-phenylazophenyl methacrylate (AzoMA) N-isopropylacrylamide (NIPAm) (P(AzoMA-r-NIPAm)) A exhibited reversible photoinduced sol–gel transition in hydrophobic ionic liquid. Such transitions can be used to realize photohealable ion gels. This study contributes deeper physicochemical understanding observed gel, showing glassy state P(AzoMA-r-NIPAm) domains is responsible for long relaxation times. Importantly, controlled photoisomerization azobenzene moieties allows glass temperature varied by choosing irradiation conditions. The understood elastic solid–viscoelastic liquid or viscoelastic transition, depending o...
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