Journal
LANGMUIR
Volume 25, Issue 16, Pages 8845-8848Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la901159r
Keywords
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan
- Japan Society for the Promotion of Science
- [452/17073009]
- [B/20350104]
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4-Phenylazophenyl methacrylate (AzoMA) and benzyl methacrylate (BnMA) were copolymerized to produce multistimuli-responsive polymers (P(AzoMA-r-BnMA)s) in a hydrophobic ionic liquid (IL), 1-ethyl-3-methylimidazolium bis(trifluoromethane sulfonyl)imide ([C(2)mim][NTf2]), as the solvent. P(AzoMA-r-BnMA)s with a maximum of ca. 4 mol % AzoMA were soluble in [C(2)mim][NTf2] at low temperatures, and they underwent lower critical solution temperature (LCST) phase separation with all increase in temperature. Under UV and visible light irradiation, P(AzoMA-r-BnMA)s underwent reversible photochromism of trans-to-cis and cis-to-trans isomerization, respectively. The LCST temperature differences between trans- and cis-form polymers in the IL were as large as 22 degrees C. Reversible photoinduced phase separation of the polymers was achieved at a certain temperature; at this temperature, the cis-form polymers were soluble in the IL, but the trans-form polymers were not.
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