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

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 (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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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

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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.",

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

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T1 - Charge Transport in Imidazolium-Based Homo- and Triblock Poly(ionic liquid)s

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.

PY - 2019/1/22

Y1 - 2019/1/22

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.

AB - 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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