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Ionic liquid modulation of swelling and LCST behavior of nisopropylacrylamide polymer gels.
Gallagher, Simon; Kavanagh, Andrew; Ziółkowski, Bartosz; Florea, Larisa; MacFarlane, Douglas R.; Fraser, Kevin J.; Diamond, Dermot
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 dycanamide ([P6,6,6,14][DCA]) are described. The Lower Critical Solution Temperature (LCST) of the resulting ionogel was found to vary between 24 – 31 oC. 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.
Keyword(s): Thin films; Chemistry; Ionic liquids
Publication Date:
Type: Other
Peer-Reviewed: Unknown
Language(s): English
Institution: Dublin City University
Citation(s): Gallagher, Simon, Kavanagh, Andrew, Ziółkowski, Bartosz ORCID: 0000-0001-6233-7977 <>, Florea, Larisa ORCID: 0000-0002-4704-2393 <>, MacFarlane, Douglas R., Fraser, Kevin J. ORCID: 0000-0002-9718-5405 <> and Diamond, Dermot ORCID: 0000-0003-2944-4839 <> (2013) Ionic liquid modulation of swelling and LCST behavior of nisopropylacrylamide polymer gels. Physical Chemistry Chemical Physics, 16 . pp. 3610-3616. ISSN 1463-9076
Publisher(s): Royal Society of Chemistry
File Format(s): application/pdf
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First Indexed: 2014-04-17 05:44:17 Last Updated: 2019-02-09 06:26:49