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Title: Effect of Chain Rigidity on the Decoupling of Ion Motion from Segmental Relaxation in Polymerized Ionic Liquids: Ambient and Elevated Pressure Studies

Journal Article · · Macromolecules
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [1];  [2]; ORCiD logo [4];  [2];  [1]; ORCiD logo [1]; ORCiD logo [2];  [5]; ORCiD logo [6]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
  2. Univ. of Tennessee, Knoxville, TN (United States). Department of Chemistry
  3. Univ. of Cincinnati, OH (United States). Department of Aerospace Engineering & Engineering Mechanics
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences and Computational Sciences & Engineering Division
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division; Univ. of Tennessee, Knoxville, TN (United States). Department of Chemistry
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division; Univ. of Tennessee, Knoxville, TN (United States). Department of Chemistry and Department of Physics and Astronomy

Conductivity in polymer electrolytes has been generally discussed with the assumption that the segmental motions control charge transport. However, much less attention has been paid to the mechanism of ion conductivity where the motions of ions are less dependent (decoupled) on segmental dynamics. We present that this phenomenon is observed in ionic materials as they approach their glass transition temperature and becomes essential for design and development of highly conducting solid polymer electrolytes. In this paper, we study the effect of chain rigidity on the decoupling of ion transport from segmental motion in three polymerized ionic liquids (polyILs) containing the same cation–anion pair but differing in flexibility of the polymer backbones and side groups. Analysis of dielectric and rheology data reveals that decoupling is strong in vinyl-based rigid polymers while almost negligible in novel siloxane-based flexible polyILs. To explain this behavior, we investigated ion and chain dynamics at ambient and elevated pressure. Our results suggest that decoupling has a direct relationship to the frustration in chain packing and free volume. Finally, these conclusions are also supported by coarse-grained molecular dynamics simulations.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1394356
Alternate ID(s):
OSTI ID: 1408579
Journal Information:
Macromolecules, Vol. 50, Issue 17; ISSN 0024-9297
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 73 works
Citation information provided by
Web of Science

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Block Copolymers: Synthesis, Self-Assembly, and Applications journal October 2017
Polymerized ionic liquids: Effects of counter-anions on ion conduction and polymerization kinetics journal April 2018
Influence of chain stiffness on the dynamical heterogeneity and fragility of polymer melts journal December 2018
Synthesis of ionic polymers by free radical polymerization using aprotic trimethylsilylmethyl‐substituted monomers journal April 2020
Decoupling segmental relaxation and ionic conductivity for lithium-ion polymer electrolytes journal January 2019
Decoupling segmental relaxation and ionic conductivity for lithium-ion polymer electrolytes text January 2019
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