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

Author:
Mapesa, Emmanuel U., Chen, Mingtao, Heres, Maximilian F., Harris, Matthew A., Kinsey, Thomas, Wang, Yangyang, Long, Timothy E., Lokitz, Bradley S., Sangoro, Joshua R.
Source:
Macromolecules 2019 v.52 no.2 pp. 620-628
ISSN:
1520-5835
Subject:
ambient temperature, bromides, composite polymers, dielectric spectroscopy, differential scanning calorimetry, glass transition temperature, ionic liquids, polystyrenes
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.
Agid:
6272157