Charge Transport and Ion Dynamics in Imidazolium-Based Homo- and Tri-Block Poly(Ionic Liquid)s

POSTER

Abstract

Broadband Dielectric Spectroscopy (BDS) and Differential Scanning Calorimetry (DSC) are used to probe ion dynamics in a series of imidazolium-based tri-block copolymers, and compared to their homopolymer analogues. Two calorimetric glass transitions are observed and assigned to the charged and uncharged (polystyrene) blocks. Exchanging bromide with bis(trifluoromethylsulfonyl)amide counter-ion, a change of the glass transition temperature by over 50 K is realized, bringing forth an increase in the room-temperature dc-ionic conductivity by over six (6) orders of magnitude. By systematically varying the volume fraction of the charged block, we demonstrate that the choice of counter-ion is the key parameter influencing charge transport in these systems.

*A.M.H., E.U.M., M.A.H. and M.F.H. are grateful for financial support by the National Science Foundation,
Division of Materials Research, Polymers Program through DMR-1508394. J.S. gratefully
acknowledges partial support from the U.S. Army Research Office under Contract W911NF-17-
1-0052. This research was suported by Oak Ridge National Laboratory’s (ORNL) Laboratory
Directed Research and Development Program. This work is also supported by the US National Science Foundation under award number
DMR 1507764.

Presenters

  • Alexandre Horton

    • Chemical and Biomolecular Engineering, University of Tennessee, Knoxville

Authors

  • Alexandre Horton

    • Chemical and Biomolecular Engineering, University of Tennessee, Knoxville

  • Emmanuel Mapesa

    • University of Tennessee
    • Chemical and Biomolecular Engineering, University of Tennessee, Knoxville
    • Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville

  • Mingtao Chen

    • Chemistry, Macromolecules Innovation Institute (MII), Virginia Tech University

  • Maximilian F Heres

    • Chemical and Biomolecular Engineering, University of Tennessee, Knoxville

  • Matthew Harris

    • Chemical and Biomolecular Engineering, University of Tennessee, Knoxville
    • University of Tennessee

  • Yangyang Wang

    • Center for Nanophase Materials Sciences, Oak Ridge National Laboratory
    • Oak Ridge National Laboratory

  • Timothy Long

    • Chemistry, Macromolecules Innovation Institute (MII), Virginia Tech University

  • Bradley Lokitz

    • Center for Nanophase Materials Sciences, Oak Ridge National Laboratory

  • Joshua Sangoro

    • Chemical and Biomolecular Engineering, University of Tennessee
    • University of Tennessee
    • Chemical and Biomolecular Engineering, University of Tennessee, Knoxville
    • Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville