Structure and dynamics of short-chain polymerized ionic liquids

Wieland, Felix; Bocharova, Vera; Münzner, P.; Hiller, W.; Sakrowski, R.; Sternemann, Christian; Böhmer, Roland; Sokolov, Alexei P.; Gainaru, Catalin

doi:10.1063/1.5109228

Title: Structure and dynamics of short-chain polymerized ionic liquids

Journal Article · Tue Jul 16 00:00:00 EDT 2019 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.5109228· OSTI ID:1558518

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Technische Univ. of Dortmund (Germany)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Combining experimental results obtained with X-ray scattering and field-gradient nuclear magnetic resonance (NMR) and an assessment of new and previous dielectric and rheology data, our study focuses on the molecular weight (M_w) evolution of local structure and dynamics in a homologous series of covalently bonded ionic liquids. Performed on a family of electrolytes with a tailored degree of ionic decoupling, this study reveals the differences between monomeric and oligomeric melts with respect to their structural organization, mass and charge transport, and molecular diffusion. Our work demonstrates that for the monomeric compound, the broadband conductivity and mechanical spectra reflect the same underlying distribution of activation barriers and that the Random Barrier Model describes fairly well both the ionic and structural relaxation processes in these materials. Moreover, the oligomers with chains comprising ten segments only exhibit both structural and dynamical fingerprints of a genuine polymer. A comparison of conductivity levels estimated using the self-diffusion coefficients probed via NMR and those probed directly with dielectric spectroscopy reflects the emerging of ion correlations which are affecting the macroscopic charge transport in these materials in a chain-length dependent manner.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; German Research Foundation (DFG)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1558518

Journal Information:: Journal of Chemical Physics, Vol. 151, Issue 3; ISSN 0021-9606

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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