From Macromolecular to Small-Molecular Triggers: Facile Method toward Photoinduced LCST Phase Behavior of Thermoresponsive Polymers in Mixed Ionic Liquids Containing an Azobenzene Moiety

Caihong Wang, Xiaofeng Ma, Yuzo Kitazawa, Yumi Kobayashi, Shiguo Zhang, Hisashi Kokubo, Masayoshi Watanabe

Abstract

Instead of the reported photoinduced lower critical solution temperature (LCST) phase transition behavior in ionic liquids (ILs) achieved by photofunctional polymers, this study reports the facile photoinduced LCST phase behavior of nonfunctionalized polymers (poly(benzyl methacrylate) (PBnMA) and poly(2-phenylethyl methacrylate) (PPhEtMA)) in mixed ILs (1,3-dimethylimidazolium bis(trifluoromethanesulfonyl)amide; [C1mim][NTf2] and a newly designed functionalized IL containing an azobenzene moiety (1-butyl-3-(4-phenylazobenzyl)imidazolium bis(trifluoromethanesulfonyl)amide; [Azo][NTf2])) as a small-molecular photo trigger. Interestingly, the length of the alkyl spacer between the ester and aryl groups, which is the only structural difference between the two polymers, leads to two different photoresponsive LCST phase transition behaviors. On the basis of spectroscopic studies, the different phase transition behaviors of PBnMA and PPhEtMA may attribute to the different cooperative interactions between the polymers and [C1mim][NTf2]. (Figure presented.).

Original languageEnglish
Pages (from-to)1960-1965
Number of pages6
JournalMacromolecular Rapid Communications
Volume37
Issue number23
DOIs
StatePublished - 2016 Dec 1

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Polymers
Ionic liquids
Phase transitions
Temperature
Amides
Azobenzene
Phase behavior
Esters

Keywords

  • azobenzene
  • ionic liquids
  • phase separation
  • photochemistry
  • stimuli-sensitive polymers

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

Cite this

From Macromolecular to Small-Molecular Triggers : Facile Method toward Photoinduced LCST Phase Behavior of Thermoresponsive Polymers in Mixed Ionic Liquids Containing an Azobenzene Moiety. / Wang, Caihong; Ma, Xiaofeng; Kitazawa, Yuzo; Kobayashi, Yumi; Zhang, Shiguo; Kokubo, Hisashi; Watanabe, Masayoshi.

In: Macromolecular Rapid Communications, Vol. 37, No. 23, 01.12.2016, p. 1960-1965.

Research output: Contribution to journalArticle

Wang, Caihong; Ma, Xiaofeng; Kitazawa, Yuzo; Kobayashi, Yumi; Zhang, Shiguo; Kokubo, Hisashi; Watanabe, Masayoshi / From Macromolecular to Small-Molecular Triggers : Facile Method toward Photoinduced LCST Phase Behavior of Thermoresponsive Polymers in Mixed Ionic Liquids Containing an Azobenzene Moiety.

In: Macromolecular Rapid Communications, Vol. 37, No. 23, 01.12.2016, p. 1960-1965.

Research output: Contribution to journalArticle

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