Cluster–Micelle Transition of a Thermo- and Photoresponsive ABC Triblock Copolymer in an Ionic Liquid
Aya Saruwatari A , Kei Hashimoto A , Ryota Tamate A , Ryoji Usui A , Hisashi Kokubo A and Masayoshi Watanabe A BA Department of Chemistry and Biotechnology, Yokohama National University, 79–5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
B Corresponding author. Email: mwatanab@ynu.ac.jp
Australian Journal of Chemistry 72(2) 155-159 https://doi.org/10.1071/CH18349
Submitted: 22 July 2018 Accepted: 4 September 2018 Published: 25 September 2018
Abstract
We report the photocontrollable micelle–cluster transition of an ABC-type triblock copolymer in an ionic liquid (IL). Polystyrene-b-poly(ethylene oxide)-b-poly(4-phenylazobenzyl acrylamide-r-N-isopropylacrylamide) (PSt-b-PEO-b-P(AzoBnAm-r-NIPAm)) was synthesised, where PSt is IL-phobic, PEO is IL-philic, and P(AzoBnAm-r-NIPAm) is photo- and thermoresponsive in the IL. At high temperatures, the triblock copolymer forms micelles with PSt cores; furthermore, at low temperatures, micelles self-assemble into clusters induced by the aggregation of P(AzoBnAm-r-NIPAm). Under UV irradiation, the micelles form clusters at lower temperatures than that in the dark because of the change in the solubility of P(AzoBnAm-r-NIPAm) induced by photoisomerisation of the azobenzene groups, indicating that this triblock copolymer has a photocontrollable micelle–cluster transition temperature.
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