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Decoupling of ionic conductivity from structural dynamics in polymerized ionic liquids

  • 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.

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Author:Joshia R. Sangoro, C. Iacob, A. L. Agapov, Yangyang Wang, Stefan BerdzinskiGND, Hans Rexhausen, Veronika StrehmelORCiDGND, C. Friedrich, A. P. Sokolov, F. Kremer
Pubmed Id:
Parent Title (English):Soft matter
Publisher:Royal Society of Chemistry
Place of publication:Cambridge
Document Type:Article
Year of first Publication:2014
Year of Completion:2014
Release Date:2017/03/27
Page Number:5
First Page:3536
Last Page:3540
Funder:Deutsche Forschungsgemeinschaft under the DFG SPP 1191 Priority Program on Ionic Liquids; NSF Chemistry program [CHE-1213444]; University of Potsdam for mass spectrometric investigation; Fraunhofer Institute for Applied Polymer Research Potsdam-Golm
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie
Peer Review:Referiert