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

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dc.contributor.authorJangu, Chainikaen
dc.contributor.authorWang, Jing-Han Helenen
dc.contributor.authorWang, Dongen
dc.contributor.authorFahs, Gregory B.en
dc.contributor.authorHeflin, James R.en
dc.contributor.authorMoore, Robert Bowenen
dc.contributor.authorColby, Ralph H.en
dc.contributor.authorLong, Timothy E.en
dc.contributor.departmentChemistryen
dc.contributor.departmentMacromolecules Innovation Instituteen
dc.contributor.departmentPhysicsen
dc.contributor.departmentThe Pennsylvania State University. Department of Chemical Engineeringen
dc.contributor.departmentThe Pennsylvania State University. Department of Materials Science and Engineeringen
dc.date.accessed2016-03-17en
dc.date.accessioned2016-03-18T22:24:54Zen
dc.date.available2016-03-18T22:24:54Zen
dc.date.issued2015-03-06en
dc.description.abstractReversible 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[registered sign] membrane, suggesting potential for ionic polymer device applications. This was attributed to optimum modulus, improved ionic conductivity, and microphase-separated morphology of triblock copolymers.en
dc.description.notes2015 Royal Society of Chemistry Open Access Gold Articleen
dc.description.sponsorshipU.S. Army Research Laboratoryen
dc.description.sponsorshipUnited States. Army Research Officeen
dc.description.sponsorshipMultidisciplinary University Research Initiative (MURI). Ionic Liquids in Electro-active Devices Program (ILED)en
dc.description.sponsorshipLaboratory for Research on the Structure of Matter (University of Pennsylvania)en
dc.format.extent11 p.en
dc.format.mimetypeapplication/pdfen
dc.identifier.citationJangu, C., Wang, J.-H. H., Wang, D., Fahs, G., Heflin, J. R., Moore, R. B., Colby, R. H., & 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. doi:10.1039/C5TC00169Ben
dc.identifier.doihttps://doi.org/10.1039/C5TC00169Ben
dc.identifier.issn2050-7526en
dc.identifier.issue16en
dc.identifier.other2015_Jangu_Imidazole_containing_triblock_copol.pdfen
dc.identifier.otherImidazole_containing_triblock_supp.pdfen
dc.identifier.otherW911NF-07-1-0452en
dc.identifier.otherMRSEC NSF DMR11-20901en
dc.identifier.urihttp://hdl.handle.net/10919/64955en
dc.identifier.volume3en
dc.language.isoen_USen
dc.publisherThe Royal Society of Chemistryen
dc.rightsCreative Commons Attribution-NonCommercial 3.0 Unporteden
dc.rights.urihttp://creativecommons.org/licenses/by-nc/3.0/en
dc.titleImidazole-containing triblock copolymers with a synergy of ether and imidazolium sitesen
dc.title.serialJournal of Materials Chemistry Cen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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