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

doi:10.1021/acs.macromol.8b02143

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 journal › Article › peer-review

3 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 (T_g) 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 T_g 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 language	English
Pages (from-to)	620-628
Number of pages	9
Journal	Macromolecules
Volume	52
Issue number	2
DOIs	https://doi.org/10.1021/acs.macromol.8b02143
Publication status	Published - 2019 Jan 22
Externally published	Yes

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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10.1021/acs.macromol.8b02143

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Charge Transport in Imidazolium-Based Homo- and Triblock Poly(ionic liquid)s. / Mapesa, Emmanuel U.; Chen, Mingtao; Heres, Maximilian F.; Harris, Matthew A.; Kinsey, Thomas; Wang, Yangyang; Long, Timothy Edward; Lokitz, Bradley S.; Sangoro, Joshua R.

In: Macromolecules, Vol. 52, No. 2, 22.01.2019, p. 620-628.

Research output: Contribution to journal › Article › peer-review

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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.",

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AU - Mapesa, Emmanuel U.

AU - Chen, Mingtao

AU - Heres, Maximilian F.

AU - Harris, Matthew A.

AU - Kinsey, Thomas

AU - Wang, Yangyang

AU - Long, Timothy Edward

AU - Lokitz, Bradley S.

AU - Sangoro, Joshua R.

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N2 - 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.

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