Journal
POLYMER
Volume 53, Issue 17, Pages 3677-3686Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2012.06.023
Keywords
Block copolymers; Ionic liquid; Actuators
Categories
Funding
- U.S. Army Research Office [W911NF-07-1-0452]
- Institute for Critical Technology and Applied Science (ICTAS)
- Army Research Office (ARO) [W911NF-10-1-0307]
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Nitroxide-mediated polymerization enabled the synthesis of cationic, imidazolium-containing triblock copolymers as a membrane for an electromechanical transducer. Nitroxide-mediated polymerization afforded poly(styrene-b-[1-ethyl-3-(4-vinylbenzyl)imidazolium bis(trifluoromethane sulfonyl)imide)]-b-styrene) in a controlled fashion as confirmed using aqueous size exclusion chromatography and H-1 NMR spectroscopy. Dynamic mechanical analysis revealed a modulus of approximately 100 MPa for the triblock copolymer at 23 degrees C, which was suitable for fabrication of an electromechanical actuator. Evaluation of electromechanical actuators revealed device curvatures over twice the curvatures for Nafion (R) in both the presence and absence of a conductive network composite. Addition of the ionic liquid (IL) 1-ethyl-3-methylimidazolium trifluoromethane sulfonate selectively reduced the glass transition temperature (T-g) of the central block and increased overall ionic conductivity. Normalizing temperature with the central block T-g caused the ionic conductivity for the IL-incorporated polymers to collapse onto a single curve, which was an order of magnitude higher than the block copolymer in the absence of added IL (C) 2012 Elsevier Ltd. All rights reserved.
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