Effect of Chain Rigidity on the Decoupling of Ion Motion from Segmental Relaxation in Polymerized Ionic Liquids: Ambient and Elevated Pressure Studies
Abstract
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.
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
- Univ. of Tennessee, Knoxville, TN (United States). Department of Chemistry
- Univ. of Cincinnati, OH (United States). Department of Aerospace Engineering & Engineering Mechanics
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences and Computational Sciences & Engineering Division
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division; Univ. of Tennessee, Knoxville, TN (United States). Department of Chemistry
- 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
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1394356
- Alternate Identifier(s):
- OSTI ID: 1408579
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Macromolecules
- Additional Journal Information:
- Journal Volume: 50; Journal Issue: 17; 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
Wojnarowska, Zaneta, Feng, Hongbo, Fu, Yao, Cheng, Shiwang, Carroll, Bobby, Kumar, Rajeev, Novikov, Vladimir N., Kisliuk, Alexander M., Saito, Tomonori, Kang, Nam-Goo, Mays, Jimmy W., Sokolov, Alexei P., and Bocharova, Vera. Effect of Chain Rigidity on the Decoupling of Ion Motion from Segmental Relaxation in Polymerized Ionic Liquids: Ambient and Elevated Pressure Studies. United States: N. p., 2017.
Web. doi:10.1021/acs.macromol.7b01217.
Wojnarowska, Zaneta, Feng, Hongbo, Fu, Yao, Cheng, Shiwang, Carroll, Bobby, Kumar, Rajeev, Novikov, Vladimir N., Kisliuk, Alexander M., Saito, Tomonori, Kang, Nam-Goo, Mays, Jimmy W., Sokolov, Alexei P., & Bocharova, Vera. Effect of Chain Rigidity on the Decoupling of Ion Motion from Segmental Relaxation in Polymerized Ionic Liquids: Ambient and Elevated Pressure Studies. United States. https://doi.org/10.1021/acs.macromol.7b01217
Wojnarowska, Zaneta, Feng, Hongbo, Fu, Yao, Cheng, Shiwang, Carroll, Bobby, Kumar, Rajeev, Novikov, Vladimir N., Kisliuk, Alexander M., Saito, Tomonori, Kang, Nam-Goo, Mays, Jimmy W., Sokolov, Alexei P., and Bocharova, Vera. Mon .
"Effect of Chain Rigidity on the Decoupling of Ion Motion from Segmental Relaxation in Polymerized Ionic Liquids: Ambient and Elevated Pressure Studies". United States. https://doi.org/10.1021/acs.macromol.7b01217. https://www.osti.gov/servlets/purl/1394356.
@article{osti_1394356,
title = {Effect of Chain Rigidity on the Decoupling of Ion Motion from Segmental Relaxation in Polymerized Ionic Liquids: Ambient and Elevated Pressure Studies},
author = {Wojnarowska, Zaneta and Feng, Hongbo and Fu, Yao and Cheng, Shiwang and Carroll, Bobby and Kumar, Rajeev and Novikov, Vladimir N. and Kisliuk, Alexander M. and Saito, Tomonori and Kang, Nam-Goo and Mays, Jimmy W. and Sokolov, Alexei P. and Bocharova, Vera},
abstractNote = {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.},
doi = {10.1021/acs.macromol.7b01217},
journal = {Macromolecules},
number = 17,
volume = 50,
place = {United States},
year = {Mon Aug 21 00:00:00 EDT 2017},
month = {Mon Aug 21 00:00:00 EDT 2017}
}
Web of Science
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