Synthesis of imidazolium ABA triblock copolymers for electromechanical transducers

Matthew D. Green, Dong Wang, Sean T. Hemp, Jae Hong Choi, Karen I. Winey, James R. Heflin, Timothy Edward Long*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

72 Citations (Scopus)


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 1H NMR spectroscopy. Dynamic mechanical analysis revealed a modulus of approximately 100 MPa for the triblock copolymer at 23 °C, which was suitable for fabrication of an electromechanical actuator. Evaluation of electromechanical actuators revealed device curvatures over twice the curvatures for Nafion ® 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.

Original languageEnglish
Pages (from-to)3677-3686
Number of pages10
JournalPolymer (United Kingdom)
Issue number17
Publication statusPublished - 2012 Aug 2
Externally publishedYes


  • Actuators
  • Block copolymers
  • Ionic liquid

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics


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