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説明:

Photo-induced tuning of lower critical solution temperature (LCST) behavior is an attractive route for reversible phase control, yet the achievable cloud-point shift is often modest in conventional solvent systems. Here, we demonstrate a composition-amplified, light-tunable LCST in ionic liquid polymer solutions using random copolymers of 4-phenylazophenyl methacrylate and phenethyl methacrylate (P(AzoMA-r-PhEtMA)) dissolved in 1-ethyl-3methylimidazolium trifluoromethylsulfonylimide ([C2mim][TFSI]), a medium in which the azobenzene-containing monomer is readily compatible. Turbidity measurements reveal opposite cloud-point shifts under UV (cis-type) and visible-light (trans-type) conditions, enabling a bistable temperature window that widens monotonically with azobenzene composition. At 37 °C, the solution is reversibly switched between one-phase and two-phase states by light alone and maintains stable cycling for more than ~40,500 s. These results provide a practical molecular design guideline for targeting ambient-to-physiological light-controlled phase separation in nonvolatile ionic liquid media.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: ionic liquid, LCST, stimuli responsive, ion gel, azobenzene, polymer, photo reversible

刊行年月日: 2026-05-13

出版者: Springer Science and Business Media LLC

掲載誌:

• Polymer Journal (ISSN: 00323896) vol. 58 issue. 10 p. 1337-1344

研究助成金:

• MEXT | Japan Society for the Promotion of Science 23H02030
• MEXT | Japan Society for the Promotion of Science 26H02296

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s41428-026-01195-0

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更新時刻: 2026-10-08 11:43:20 +0900

MDRでの公開時刻: 2026-10-08 14:25:18 +0900