Photo-induced Actuator using Temperature and Light Dual Responsive Azobenzene Containing Ion Gel in Ionic Liquid

Document identifier: oai:DiVA.org:ltu-77247
Access full text here:10.1016/j.eurpolymj.2019.109446
Keyword: Engineering and Technology, Mechanical Engineering, Tribology (Interacting Surfaces including Friction, Lubrication and Wear), Teknik och teknologier, Maskinteknik, Tribologi (ytteknik omfattande friktion, nötning och smörjning), Ionic liquid, Ion gel, Actuator, Azobenzene, LCST, Machine Elements, Maskinelement
Publication year: 2020
Relevant Sustainable Development Goals (SDGs):
SDG 9 Industry, innovation and infrastructure
The SDG label(s) above have been assigned by OSDG.ai

Abstract:

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.

Authors

Xiaofeng Ma

College of Science, Nanjing Forestry University, Nanjing, P. R. China. Institute of Polymer Materials, Nanjing Forestry University, Nanjing, P. R. China.
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Xiaoyu Lan

College of Science, Nanjing Forestry University, Nanjing, P. R. China
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Linlin Wu

College of Materials Science and Engineering, Nanjing Tech University, Nanjing, P. R. China
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Lei Wang

Institute of Polymer Materials, Nanjing Forestry University, Nanjing, P. R. China
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Qun Gu

Chemistry Department, Edinboro University of Pennsylvania, Edinboro PA, USA
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Yijun Shi

Luleå tekniska universitet; Maskinelement
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Xiaoli Gu

College of Chemical Engineering, Nanjing Forestry University, Nanjing, P. R. China
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Zhenyang Luo

College of Science, Nanjing Forestry University, Nanjing, P. R. China. Institute of Polymer Materials, Nanjing Forestry University, Nanjing, P. R. China.
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