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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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Article information


Submitted
27 Dec 2013
Accepted
31 Mar 2014
First published
02 Apr 2014

Soft Matter, 2014,10, 3536-3540
Article type
Communication
Author version available

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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