Cluster-Micelle Transition of a Thermo- and Photoresponsive ABC Triblock Copolymer in an Ionic Liquid
Cluster-Micelle Transition of a Thermo- and Photoresponsive ABC Triblock Copolymer in an Ionic Liquid
复制标题
离子液体中热响应和光响应 ABC 三嵌段共聚物的簇-胶束转变
DOI：
10.1071/ch18349
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发表时间：
2019
影响因子：
1.1
通讯作者：
Watanabe Masayoshi
中科院分区：
文献类型：
--
作者：
Saruwatari Aya;Hashimoto Kei;Tamate Ryota;Usui Ryoji;Kokubo Hisashi;Watanabe Masayoshi
本文报道了ABC型三嵌段共聚物在离子液体中的光可控胶束-团簇转变。合成了聚苯乙烯-b-聚（环氧乙烷）-b-聚（4-苯基偶氮苄基丙烯酰胺-r-N-异丙基丙烯酰胺）（PSt-b-PEO-b-P（AzoBnAm-r-NIPAm）），其中PSt是疏离子液体的，PEO是亲离子液体的，P（AzoBnAm-r-NIPAm）在离子液体中具有光响应性和温度响应性。在高温下，三嵌段共聚物与PSt核心形成胶束;此外，在低温下，胶束自组装成由P（AzoBnAm-r-NIPAm）聚集诱导的簇。在紫外光照射下，由于偶氮苯基团的光致异构化引起P（AzoBnAm-r-NIPAm）溶解度的变化，胶束在较低的温度下形成团簇，表明该三嵌段共聚物具有光可控的胶束-团簇转变温度。
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.