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Role of Fast Dynamics in Conductivity of Polymerized Ionic Liquids.

Authors :
Bocharova V
Genix AC
Kisliuk A
Sala G
Osti NC
Mamontov E
Sokolov AP
Source :
The journal of physical chemistry. B [J Phys Chem B] 2020 Nov 19; Vol. 124 (46), pp. 10539-10545. Date of Electronic Publication: 2020 Nov 07.
Publication Year :
2020

Abstract

Polymerized ionic liquids (PolyILs) are promising candidates for a broad range of technologies. However, the relatively low conductivity of PolyILs at room temperature has strongly limited their applications. In this work, we provide new insights into the roles of various microscopic parameters controlling ion transport in these polymers, which are crucial for their rational design and practical applications. Using broadband dielectric spectroscopy and neutron and light scattering techniques, we found a clear connection between the activation energy for conductivity, fast dynamics, and high-frequency shear modulus in PolyILs at their glass transition temperature ( T <subscript>g</subscript> ). In particular, our analysis reveals a correlation between conductivity and the amplitude of fast picosecond fluctuations at T <subscript>g</subscript> , suggesting the possible involvement of fast dynamics in lowering the energy barrier for ion conductivity. We also demonstrate that both the activation energy for ion transport and the amplitude of the fast fluctuations depend on the high-frequency shear moduli of PolyILs, thus identifying a practically important parameter for tuning conductivity. The parameters recognized in this work and their connection to the ionic conductivity of PolyILs set the stage for a deeper understanding of the mechanism of ion transport in PolyILs in the glassy state.

Details

Language :
English
ISSN :
1520-5207
Volume :
124
Issue :
46
Database :
MEDLINE
Journal :
The journal of physical chemistry. B
Publication Type :
Academic Journal
Accession number :
33164513
Full Text :
https://doi.org/10.1021/acs.jpcb.0c07549