离子液体
偶氮苯
水溶液
相(物质)
上临界溶液温度
化学工程
材料科学
双水相体系
离子键合
高分子化学
化学
低临界溶液温度
有机化学
聚合物
催化作用
离子
工程类
共聚物
作者
Yun-tao Tang,Yige Zhang,Xi Chen,Xiaowen Xie,Ning Zhou,Zhifeng Dai,Yubing Xiong
标识
DOI:10.1002/anie.202215722
摘要
Thermally induced reversible up/down migration of poly(ionic liquid)s (PILs) in aqueous two-phase systems (ATPSs) was achieved for the first time in this study. Novel ATPSs were fabricated using azobenzene (Azo)- and benzyl (Bn)-modified PILs, and their upper and lower phases could be easily tuned using the grafting degree (GD) of the Azo and Bn groups. Bn-PIL with higher GDBn could go up into the upper phase and Azo-PIL come down to the lower phase when the temperature increased (>65 °C); this behavior was reversed at lower temperatures. Moreover, a reversible two-phase/single-phase transition was realized under UV irradiation. Experimental and simulation results revealed that the difference in the hydration capacity between Bn-PIL and Azo-PIL accounted for their unique phase-separation behavior. A versatile platform for fabricating ATPSs with tunable stimuli-responsive behavior can be realized based on our findings, which can broaden their applications in the fields of smart separation systems and functional material development.
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