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 E. 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 E. Long, Bradley S. Lokitz, Joshua R. Sangoro

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

12 Scopus citations

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 (US)
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
State	Published - Jan 22 2019
Externally published	Yes

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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title = "Charge Transport in Imidazolium-Based Homo- and Triblock Poly(ionic liquid)s",

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.",

author = "Mapesa, {Emmanuel U.} and Mingtao Chen and Heres, {Maximilian F.} and Harris, {Matthew A.} and Thomas Kinsey and Yangyang Wang and Long, {Timothy E.} 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 E.

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 (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.

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 (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.

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ER -

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

Abstract

ASJC Scopus subject areas

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