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Photo-induced Actuator using Temperature and Light Dual Responsive Azobenzene Containing Ion Gel in Ionic Liquid
College of Science, Nanjing Forestry University, Nanjing, P. R. China. Institute of Polymer Materials, Nanjing Forestry University, Nanjing, P. R. China..
College of Science, Nanjing Forestry University, Nanjing, P. R. China.
College of Materials Science and Engineering, Nanjing Tech University, Nanjing, P. R. China.
Institute of Polymer Materials, Nanjing Forestry University, Nanjing, P. R. China.
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2020 (English)In: European Polymer Journal, ISSN 0014-3057, E-ISSN 1873-1945, Vol. 123, article id 109446Article in journal (Refereed) Published
Abstract [en]

A series of well-defined random copolymers comprising butyl acrylate (BA) and 4-phenylazophenylmethacrylate (AzoMA) (P(AzoMA-r-BA)) are prepared successfully by reversible addition fragmentation chain transfer (RAFT) polymerization. P(AzoMA-r-BA)s show LCST-type phase transition in 1-butyl-3-methylimidazolium bis(trifluoromethanesulfone)amide ([C4mim][NTf2]). LCST depends on the photoisomerization state of azobenzene, as well as on the AzoMA composition in the random copolymers. LCST of (P(cis-AzoMA-r-BA) is significantly higher than that of P(trans-AzoMA-r-BA), because cis-AzoMA and trans-AzoMA behave as solvato-philic and solvato-phobic comonomer, respectively. At a bistable temperature, photo-induced phase separation is completely reversible. Secondly, based on this phenomenon, a thermo- / photo- responsive ion gel (BA-AzoMA ion gel) can be prepared by free radical polymerization of BA and AzoMA using ethylene glycol dimethacrylate (EGDMA) as crosslinker in [C4mim][NTf2]. BA-AzoMA ion gel shows high temperature contraction and low temperature expansion behavior, due to LCST-type phase behavior of polymer system consisting of AzoMA and BA. Contraction temperature of BA-AzoMA ion gel depends on photoisomerization state of the azobenzene group in polymers. At a bistable temperature, photo-induced expansion-contraction is reversible. Finally, a Photo-induced actuator can be realized using BA-AzoMA ion gel at suitable temperatures, featuring reversible bending by alternate irradiating with visible and UV light. The bending behavior is also demonstrated.

Place, publisher, year, edition, pages
Elsevier, 2020. Vol. 123, article id 109446
Keywords [en]
ionic liquid, ion gel, actuator, azobenzene, LCST
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-77247DOI: 10.1016/j.eurpolymj.2019.109446OAI: oai:DiVA.org:ltu-77247DiVA, id: diva2:1381597
Note

Validerad;2020;Nivå 2;2020-01-13 (johcin)

Available from: 2019-12-23 Created: 2019-12-23 Last updated: 2020-01-13Bibliographically approved

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Shi, Yijun

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