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Issue 8, 2014
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Ionic liquid modulation of swelling and LCST behavior of N-isopropylacrylamide polymer gels

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Abstract

The physicochemical properties of free-standing cross-linked poly(N-isopropylacrylamide) (pNIPAAM) gels, generated in the presence of the Ionic liquids (ILs), 1-ethyl-3-methylimidazolium [C2mIm]+ salts of ethylsulfate [EtSO4], dicyanamide [DCA], bis(trifluoromethylsulfonyl)imide [NTf2], and trihexyltetradecylphosphonium dicyanamide ([P6,6,6,14][DCA]) are described. The Lower Critical Solution Temperature (LCST) of the resulting ionogel was found to vary between 24–31 °C. The behaviour of swelling is found to be as high as 31.55% (±0.47, n = 3) from the initial dehydrated state, while 28.04% (±0.42, n = 3) shrinking from the hydrated swollen state is observed. For ionogels based on the [DCA] anion an unexpected complete loss of the shrinking behaviour occurs, attributed to water interactions with the nitrile group of the [DCA] anion. Scanning Electron Microscopy also reveals distinct morphological changes, for example [C2mIm][EtSO4] displays a highly porous, nodule type morphology, efficiently pre-disposed for water uptake.

Graphical abstract: Ionic liquid modulation of swelling and LCST behavior of N-isopropylacrylamide polymer gels

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Article information


Submitted
09 Aug 2013
Accepted
17 Dec 2013
First published
18 Dec 2013

Phys. Chem. Chem. Phys., 2014,16, 3610-3616
Article type
Paper

Ionic liquid modulation of swelling and LCST behavior of N-isopropylacrylamide polymer gels

S. Gallagher, A. Kavanagh, B. Zíołkowski, L. Florea, D. R. MacFarlane, K. Fraser and D. Diamond, Phys. Chem. Chem. Phys., 2014, 16, 3610
DOI: 10.1039/C3CP53397B

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