Charge Transport in Imidazolium-Based Homo- and Triblock Poly(ionic liquid)s

Emmanuel U. Mapesa, Mingtao Chen, Maximilian F. Heres, Matthew A. Harris, Thomas Kinsey, Yangyang Wang, Timothy Edward Long, Bradley S. Lokitz, Joshua R. Sangoro

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Ion dynamics in a series of imidazolium-based triblock copolymers (triblock co-PILs) are investigated using broadband dielectric spectroscopy (BDS) and differential scanning calorimetry (DSC) and compared to their homopolymer counterparts (homo-PILs). Two calorimetric glass transition temperatures (Tg) are observed corresponding to the charged poly(ionic liquid) (PIL) blocks and noncharged polystyrene (PS) blocks. Varying the counterion from Br- to NTf2 decreases the Tg of the charged block by over 50 °C, thereby increasing the room-temperature ionic dc conductivity by over 6 orders of magnitude. Interestingly, for a given anion, varying the volume fraction of the charged block, from ∼0.5 to ∼0.8, has very minimal effect on the dc ionic conductivity, indicating that the choice of counterion is the key factor influencing charge transport in these systems.

Original languageEnglish
Pages (from-to)620-628
Number of pages9
JournalMacromolecules
Volume52
Issue number2
DOIs
Publication statusPublished - 2019 Jan 22
Externally publishedYes

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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  • Cite this

    Mapesa, E. U., Chen, M., Heres, M. F., Harris, M. A., Kinsey, T., Wang, Y., Long, T. E., Lokitz, B. S., & Sangoro, J. R. (2019). Charge Transport in Imidazolium-Based Homo- and Triblock Poly(ionic liquid)s. Macromolecules, 52(2), 620-628. https://doi.org/10.1021/acs.macromol.8b02143