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Title: Effect of Molecular Weight on the Ion Transport Mechanism in Polymerized Ionic Liquids

Abstract

The unique properties of ionic liquids (ILs) have made them promising candidates for electrochemical applications. Polymerization of the corresponding ILs results in a new class of materials called polymerized ionic liquids (PolyILs). Though PolyILs offer the possibility to combine the high conductivity of ILs and the high mechanical strength of polymers, their conductivities are typically much lower than that of the corresponding small molecule ILs. In this study, seven PolyILs were synthesized having degrees of polymerization ranging from 1 to 333, corresponding to molecular weights (MW) from 482 to 160 400 g/mol. Depolarized dynamic light scattering, broadband dielectric spectroscopy, rheology, and differential scanning calorimetry were employed to systematically study the influence of MW on the mechanism of ionic transport and segmental dynamics in these materials. Finally, the modified Walden plot analysis reveals that the ion conductivity transforms from being closely coupled with structural relaxation to being strongly decoupled from it as MW increases.

Authors:
 [1];  [2];  [1];  [1];  [2];  [1];  [1];  [2];  [1];  [3];  [4]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Univ. of Tennessee, Knoxville, TN (United States) ; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Univ. of Tennessee, Knoxville, TN (United States) ; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Temperature Materials Lab. (HTML)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1271895
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Macromolecules
Additional Journal Information:
Journal Volume: 49; Journal Issue: 12; Journal ID: ISSN 0024-9297
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Fan, Fei, Wang, Weiyu, Holt, Adam P., Feng, Hongbo, Uhrig, David, Lu, Xinyi, Hong, Tao, Wang, Yangyang, Kang, Nam-Goo, Mays, Jimmy, and Sokolov, Alexei P. Effect of Molecular Weight on the Ion Transport Mechanism in Polymerized Ionic Liquids. United States: N. p., 2016. Web. doi:10.1021/acs.macromol.6b00714.
Fan, Fei, Wang, Weiyu, Holt, Adam P., Feng, Hongbo, Uhrig, David, Lu, Xinyi, Hong, Tao, Wang, Yangyang, Kang, Nam-Goo, Mays, Jimmy, & Sokolov, Alexei P. Effect of Molecular Weight on the Ion Transport Mechanism in Polymerized Ionic Liquids. United States. https://doi.org/10.1021/acs.macromol.6b00714
Fan, Fei, Wang, Weiyu, Holt, Adam P., Feng, Hongbo, Uhrig, David, Lu, Xinyi, Hong, Tao, Wang, Yangyang, Kang, Nam-Goo, Mays, Jimmy, and Sokolov, Alexei P. Tue . "Effect of Molecular Weight on the Ion Transport Mechanism in Polymerized Ionic Liquids". United States. https://doi.org/10.1021/acs.macromol.6b00714. https://www.osti.gov/servlets/purl/1271895.
@article{osti_1271895,
title = {Effect of Molecular Weight on the Ion Transport Mechanism in Polymerized Ionic Liquids},
author = {Fan, Fei and Wang, Weiyu and Holt, Adam P. and Feng, Hongbo and Uhrig, David and Lu, Xinyi and Hong, Tao and Wang, Yangyang and Kang, Nam-Goo and Mays, Jimmy and Sokolov, Alexei P.},
abstractNote = {The unique properties of ionic liquids (ILs) have made them promising candidates for electrochemical applications. Polymerization of the corresponding ILs results in a new class of materials called polymerized ionic liquids (PolyILs). Though PolyILs offer the possibility to combine the high conductivity of ILs and the high mechanical strength of polymers, their conductivities are typically much lower than that of the corresponding small molecule ILs. In this study, seven PolyILs were synthesized having degrees of polymerization ranging from 1 to 333, corresponding to molecular weights (MW) from 482 to 160 400 g/mol. Depolarized dynamic light scattering, broadband dielectric spectroscopy, rheology, and differential scanning calorimetry were employed to systematically study the influence of MW on the mechanism of ionic transport and segmental dynamics in these materials. Finally, the modified Walden plot analysis reveals that the ion conductivity transforms from being closely coupled with structural relaxation to being strongly decoupled from it as MW increases.},
doi = {10.1021/acs.macromol.6b00714},
journal = {Macromolecules},
number = 12,
volume = 49,
place = {United States},
year = {2016},
month = {6}
}

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