Imidazole-containing triblock copolymers with a synergy of ether and imidazolium sites

Chainika Jangu, Jing Han Helen Wang, Dong Wang, Gregory Fahs, James R. Heflin, Robert B. Moore, Ralph H. Colby, Timothy Edward Long

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Reversible addition-fragmentation chain transfer (RAFT) polymerization enabled the synthesis of well-defined A-BC-A triblock copolymers containing a synergy of pendant ether and imidazolium sites. The soft central BC block comprises low Tg di(ethylene glycol) methyl ether methacrylate (DEGMEMA) and 1-(4-vinylbenzyl) methyl imidazolium units. External polystyrene blocks provide mechanical reinforcement within a nanoscale morphology. Dynamic mechanical analysis (DMA) of the A-BC-A triblock copolymers exhibited a plateau region, which suggested the formation of a microphase-separated morphology. Atomic force microscopy (AFM) and small angle X-ray scattering (SAXS) collectively probed the morphology of the A-BC-A triblock copolymers, revealing long-range order at the nanoscale dimensions. Dielectric relaxation spectroscopy (DRS) examined the ion-transport properties of ionomeric A-BC-A triblock copolymers and random copolymers with different compositions. The role of morphology was demonstrated with block copolymer nanoscale structures providing superior ionic conductivity and mechanical performance compared to random copolymers. Under a 4 V direct current (DC) applied voltage, electromechanical transducers derived from these triblock copolymer membranes with added ionic liquid showed superior actuation performance compared to a benchmark Nafion® membrane, suggesting potential for ionic polymer device applications. This was attributed to optimum modulus, improved ionic conductivity, and microphase-separated morphology of triblock copolymers. This journal is

Original languageEnglish
Pages (from-to)3891-3901
Number of pages11
JournalJournal of Materials Chemistry C
Volume3
Issue number16
DOIs
Publication statusPublished - 2015 Apr 28
Externally publishedYes

Fingerprint

Ether
Block copolymers
Ethers
Ionic conductivity
Copolymers
Membranes
Methyl Ethers
Ionic Liquids
Ethylene Glycol
Methacrylates
Dielectric relaxation
Polystyrenes
Dynamic mechanical analysis
imidazole
Ethylene glycol
X ray scattering
Ionic liquids
Transport properties
Transducers
Atomic force microscopy

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

Cite this

Jangu, C., Wang, J. H. H., Wang, D., Fahs, G., Heflin, J. R., Moore, R. B., ... Long, T. E. (2015). Imidazole-containing triblock copolymers with a synergy of ether and imidazolium sites. Journal of Materials Chemistry C, 3(16), 3891-3901. https://doi.org/10.1039/c5tc00169b

Imidazole-containing triblock copolymers with a synergy of ether and imidazolium sites. / Jangu, Chainika; Wang, Jing Han Helen; Wang, Dong; Fahs, Gregory; Heflin, James R.; Moore, Robert B.; Colby, Ralph H.; Long, Timothy Edward.

In: Journal of Materials Chemistry C, Vol. 3, No. 16, 28.04.2015, p. 3891-3901.

Research output: Contribution to journalArticle

Jangu, C, Wang, JHH, Wang, D, Fahs, G, Heflin, JR, Moore, RB, Colby, RH & Long, TE 2015, 'Imidazole-containing triblock copolymers with a synergy of ether and imidazolium sites', Journal of Materials Chemistry C, vol. 3, no. 16, pp. 3891-3901. https://doi.org/10.1039/c5tc00169b
Jangu, Chainika ; Wang, Jing Han Helen ; Wang, Dong ; Fahs, Gregory ; Heflin, James R. ; Moore, Robert B. ; Colby, Ralph H. ; Long, Timothy Edward. / Imidazole-containing triblock copolymers with a synergy of ether and imidazolium sites. In: Journal of Materials Chemistry C. 2015 ; Vol. 3, No. 16. pp. 3891-3901.
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