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

Abstract

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.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]
  1. Technische Univ. of Dortmund (Germany)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; German Research Foundation (DFG)
OSTI Identifier:
1558518
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 151; Journal Issue: 3; Journal ID: ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Wieland, Felix, Bocharova, Vera, Münzner, P., Hiller, W., Sakrowski, R., Sternemann, Christian, Böhmer, Roland, Sokolov, Alexei P., and Gainaru, Catalin. Structure and dynamics of short-chain polymerized ionic liquids. United States: N. p., 2019. Web. doi:10.1063/1.5109228.
Wieland, Felix, Bocharova, Vera, Münzner, P., Hiller, W., Sakrowski, R., Sternemann, Christian, Böhmer, Roland, Sokolov, Alexei P., & Gainaru, Catalin. Structure and dynamics of short-chain polymerized ionic liquids. United States. doi:10.1063/1.5109228.
Wieland, Felix, Bocharova, Vera, Münzner, P., Hiller, W., Sakrowski, R., Sternemann, Christian, Böhmer, Roland, Sokolov, Alexei P., and Gainaru, Catalin. Tue . "Structure and dynamics of short-chain polymerized ionic liquids". United States. doi:10.1063/1.5109228.
@article{osti_1558518,
title = {Structure and dynamics of short-chain polymerized ionic liquids},
author = {Wieland, Felix and Bocharova, Vera and Münzner, P. and Hiller, W. and Sakrowski, R. and Sternemann, Christian and Böhmer, Roland and Sokolov, Alexei P. and Gainaru, Catalin},
abstractNote = {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 (Mw) 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.},
doi = {10.1063/1.5109228},
journal = {Journal of Chemical Physics},
number = 3,
volume = 151,
place = {United States},
year = {2019},
month = {7}
}

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