Well-defined imidazolium ABA triblock copolymers as ionic-liquid-containing electroactive membranes

Chainika Jangu, Jing Han Helen Wang, Dong Wang, Sharon Sharick, James R. Heflin, Karen I. Winey, Ralph H. Colby, Timothy E. Long

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

Nitroxide-mediated polymerization (NMP) affords the synthesis of well-defined ABA triblock copolymers with polystyrene external blocks and a charged poly(1-methyl-3-(4-vinylbenzyl)imidazolium bis(trifluoromethane sulfonyl)imide central block. Aqueous size-exclusion chromatography (SEC) and 1H NMR spectroscopy studies confirm the control of the composition and block lengths for both the central and external blocks. Dynamic mechanical analysis (DMA) reveals a room temperature modulus suitable for fabricating these triblock copolymers into electroactive devices in the presence of an added ionic liquid. Dielectric relaxation spectroscopy (DRS) elucidates the ion-transport properties of the ABA triblock copolymers with varied compositions. The ionic conductivity in these single-ion conductors exhibits Vogel-Fulcher-Tammann (VFT) and Arrhenius temperature dependences, and electrode polarization (EP) analysis determines the number density of simultaneously conducting ions and their mobility. The actuators derived from these triblock copolymer membranes experience similar actuation speeds at an applied voltage of 4 V DC, as compared with benchmark Nafion membranes. These tailorable ABA block copolymers are promising candidates for ionic-polymer device applications.

Original languageEnglish (US)
Pages (from-to)1319-1331
Number of pages13
JournalMacromolecular Chemistry and Physics
Volume215
Issue number13
DOIs
StatePublished - Jul 2014

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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