Effect of Morphology and Segmental Dynamics on Ion Transport in Polymerized Lyotropic Liquid Crystals Containing Ionic Liquid
ORAL
Abstract
We investigate how the morphology and segmental dynamics affect the ion transport in polymerized lyotropic liquid crystals (polyLLCs) containing 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid (IL). We demonstrate that grain size and chain density at the interface are the two important factors that affect ion conduction in polyLLCs. The polyLLC with large grain size (70 nm) showed significant reduction in ion conductivity (one order of magnitude) compared to its homopolymer/IL mixture counterpart. However, the polyLLC with small grain size (20 nm) has little difference in ion conductivity compared to the corresponding homopolymer/IL mixture. It is observed that decreasing the chain density enhances the interaction of IL with polymer chains and consequently slows the relaxation of polymer chains. In addition, comparing the dynamics of polymer chains in mixtures of homopolymer/IL and templated LLC mesophases shows that the confinement in LLC structures prolongs the relaxation of polymer chains.
*This work was supported through a grant by New Mexico NASA EPSCoR Research Infrastructure Development (RID), Cooperative Agreement Number 80NSSC19M0181. Parts of this work were performed at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the US Department of Energy (DOE) Office of Science. Los Alamos National Laboratory, an affirmative action equal opportunity employer, is managed by Triad National Security, LLC for the US DOE's NNSA under contract 89233218CNA000001.
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Publication: Bandegi, A.; Kim, K.; Foudazi, R. J. Polym. Sci. 2021, 59, 2334-2344.
Presenters
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Kyungtae Kim
- Los Alamos National Laboratory
- Center for Integrated Nanotechnologies at LANL