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Issue 20, 2014
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Decoupling of ionic conductivity from structural dynamics in polymerized ionic liquids

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Abstract

Charge transport and structural dynamics in low molecular weight and polymerized 1-vinyl-3-pentylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquids (ILs) are investigated by a combination of broadband dielectric spectroscopy, dynamic mechanical spectroscopy and differential scanning calorimetry. While the dc conductivity and fluidity exhibit practically identical temperature dependence for the non-polymerized IL, a significant decoupling of ionic conduction from structural dynamics is observed for the polymerized IL. In addition, the dc conductivity of the polymerized IL exceeds that of its molecular counterpart by four orders of magnitude at their respective calorimetric glass transition temperatures. This is attributed to the unusually high mobility of the anions especially at lower temperatures when the structural dynamics is significantly slowed down. A simple physical explanation of the possible origin of the remarkable decoupling of ionic conductivity from structural dynamics is proposed.

Graphical abstract: Decoupling of ionic conductivity from structural dynamics in polymerized ionic liquids

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Publication details

The article was received on 27 Dec 2013, accepted on 31 Mar 2014 and first published on 02 Apr 2014


Article type: Communication
DOI: 10.1039/C3SM53202J
Author version available: Download Author version (PDF)
Citation: Soft Matter, 2014,10, 3536-3540
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    Decoupling of ionic conductivity from structural dynamics in polymerized ionic liquids

    J. R. Sangoro, C. Iacob, A. L. Agapov, Y. Wang, S. Berdzinski, H. Rexhausen, V. Strehmel, C. Friedrich, A. P. Sokolov and F. Kremer, Soft Matter, 2014, 10, 3536
    DOI: 10.1039/C3SM53202J

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