Imidazolium-Containing ABA Triblock Copolymers as Electroactive Devices

Evan Margaretta; Gregory B. Fahs; David L. Inglefield; Chainika Jangu; Dong Wang; James R. Heflin; Robert B. Moore; Timothy E. Long

doi:10.1021/acsami.5b09965

Imidazolium-Containing ABA Triblock Copolymers as Electroactive Devices

Evan Margaretta, Gregory B. Fahs, David L. Inglefield, Chainika Jangu, Dong Wang, James R. Heflin, Robert B. Moore, Timothy E. Long

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

38 Scopus citations

Abstract

Two-step reversible addition-fragmentation chain transfer (RAFT) polymerization and two subsequent postpolymerization modification steps afforded well-defined ABA triblock copolymers featuring mechanically reinforcing polystyrene outer blocks and 1-methylimidazole-neutralized poly(acrylic acid)-based central blocks. Size exclusion chromatography and ¹H NMR spectroscopy confirmed predictable molecular weights and narrow distributions. The ionic liquid (IL) 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([EMIm][OTf]) was incorporated at 30 wt % into polymeric films. Thermogravimetric analysis, differential scanning calorimetry, and dynamic mechanical analysis determined the thermomechanical properties of the polymers and polymer-IL composites. Atomic force microscopy, small-angle X-ray scattering (SAXS), and transmission electron microscopy (TEM) determined surface and bulk morphologies, and poly(Sty-b-AA(MeIm)-b-Sty) exhibited a change from packed cylindrical to lamellar morphology in SAXS upon IL incorporation. Electrochemical impedance spectroscopy determined the in-plane ionic conductivities of the polymer-IL membranes (μ 10^-4 S/cm). A device fabricated from poly(Sty-b-AA(MeIm)-b-Sty) with 30 wt % incorporated IL demonstrated mechanical actuation under a low applied voltage of 4 V.

Original language	English (US)
Pages (from-to)	1280-1288
Number of pages	9
Journal	ACS Applied Materials and Interfaces
Volume	8
Issue number	2
DOIs	https://doi.org/10.1021/acsami.5b09965
State	Published - Jan 20 2016
Externally published	Yes

Keywords

block copolymers
controlled polymerization
electromechanical actuators
ionic liquids
self-assembly

ASJC Scopus subject areas

General Materials Science

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10.1021/acsami.5b09965

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title = "Imidazolium-Containing ABA Triblock Copolymers as Electroactive Devices",

abstract = "Two-step reversible addition-fragmentation chain transfer (RAFT) polymerization and two subsequent postpolymerization modification steps afforded well-defined ABA triblock copolymers featuring mechanically reinforcing polystyrene outer blocks and 1-methylimidazole-neutralized poly(acrylic acid)-based central blocks. Size exclusion chromatography and 1H NMR spectroscopy confirmed predictable molecular weights and narrow distributions. The ionic liquid (IL) 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([EMIm][OTf]) was incorporated at 30 wt % into polymeric films. Thermogravimetric analysis, differential scanning calorimetry, and dynamic mechanical analysis determined the thermomechanical properties of the polymers and polymer-IL composites. Atomic force microscopy, small-angle X-ray scattering (SAXS), and transmission electron microscopy (TEM) determined surface and bulk morphologies, and poly(Sty-b-AA(MeIm)-b-Sty) exhibited a change from packed cylindrical to lamellar morphology in SAXS upon IL incorporation. Electrochemical impedance spectroscopy determined the in-plane ionic conductivities of the polymer-IL membranes (μ 10-4 S/cm). A device fabricated from poly(Sty-b-AA(MeIm)-b-Sty) with 30 wt % incorporated IL demonstrated mechanical actuation under a low applied voltage of 4 V.",

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author = "Evan Margaretta and Fahs, {Gregory B.} and Inglefield, {David L.} and Chainika Jangu and Dong Wang and Heflin, {James R.} and Moore, {Robert B.} and Long, {Timothy E.}",

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AU - Margaretta, Evan

AU - Fahs, Gregory B.

AU - Inglefield, David L.

AU - Jangu, Chainika

AU - Wang, Dong

AU - Heflin, James R.

AU - Moore, Robert B.

AU - Long, Timothy E.

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AB - Two-step reversible addition-fragmentation chain transfer (RAFT) polymerization and two subsequent postpolymerization modification steps afforded well-defined ABA triblock copolymers featuring mechanically reinforcing polystyrene outer blocks and 1-methylimidazole-neutralized poly(acrylic acid)-based central blocks. Size exclusion chromatography and 1H NMR spectroscopy confirmed predictable molecular weights and narrow distributions. The ionic liquid (IL) 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([EMIm][OTf]) was incorporated at 30 wt % into polymeric films. Thermogravimetric analysis, differential scanning calorimetry, and dynamic mechanical analysis determined the thermomechanical properties of the polymers and polymer-IL composites. Atomic force microscopy, small-angle X-ray scattering (SAXS), and transmission electron microscopy (TEM) determined surface and bulk morphologies, and poly(Sty-b-AA(MeIm)-b-Sty) exhibited a change from packed cylindrical to lamellar morphology in SAXS upon IL incorporation. Electrochemical impedance spectroscopy determined the in-plane ionic conductivities of the polymer-IL membranes (μ 10-4 S/cm). A device fabricated from poly(Sty-b-AA(MeIm)-b-Sty) with 30 wt % incorporated IL demonstrated mechanical actuation under a low applied voltage of 4 V.

KW - block copolymers

KW - controlled polymerization

KW - electromechanical actuators

KW - ionic liquids

KW - self-assembly

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Imidazolium-Containing ABA Triblock Copolymers as Electroactive Devices

Abstract

Keywords

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