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Issue 6, 2013
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Preparation of free-standing thermosensitive composite gel particles incorporating ionic liquids

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Abstract

Composite gel particles consisting of 2-phenylethyl methacrylate (PhEMA)-vinyl toluene (VT) copolymer (P(PhEMA-VT)) and poly(methyl methacrylate) (PMMA) were prepared by seeded polymerization of MMA in the presence of P(PhEMA-VT)/1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide ([Bmim][TFSA], IL) gel particles, in which P(PhEMA-VT) exhibited lower critical solution temperature (LCST)-type phase transition behavior in IL. The particles obtained at 70 °C (above the LCST) adopted a phase-separated snowman-like shape and clearly exhibited volume–phase transition behavior in which the P(PhEMA-VT) phase reduced in size and the PMMA phase increased in size above the LCST. The P(PhEMA-VT) phase exhibited LCST-type volume–phase transition behavior and separation of IL occurred. In contrast, the PMMA phase was swollen with IL separated from the P(PhEMA-VT) phase, in which the PMMA phase could act as a preserver of IL. Interestingly, the composite gel particles exhibited similar volume–phase transition behavior in both air and vacuum without leakage of IL from the gel particles, which should be free-standing thermosensitive gel particles.

Graphical abstract: Preparation of free-standing thermosensitive composite gel particles incorporating ionic liquids

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Publication details

The article was received on 17 Oct 2012, accepted on 05 Dec 2012 and first published on 18 Dec 2012


Article type: Communication
DOI: 10.1039/C2SM27393D
Citation: Soft Matter, 2013,9, 1761-1765

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    Preparation of free-standing thermosensitive composite gel particles incorporating ionic liquids

    T. Suzuki, H. Ichikawa, M. Nakai and H. Minami, Soft Matter, 2013, 9, 1761
    DOI: 10.1039/C2SM27393D

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