Optimization of anionic conductivity through the coexistence of ionomer cluster and backbone-backbone morphologies in anion exchange membranes

Nwosu, Chinomso; Pandey, Tara P.; Herring, Andrew M.; Seifert, Soenke; Coughlin, E. Bryan

doi:10.1002/pol.20200629

Optimization of anionic conductivity through the coexistence of ionomer cluster and backbone-backbone morphologies in anion exchange membranes

Journal Article · Sat Nov 07 00:00:00 EST 2020 · Journal of Polymer Science

DOI:https://doi.org/10.1002/pol.20200629· OSTI ID:1818453

Nwosu, Chinomso ^[1]; Pandey, Tara P. ^[2]; ^[2]; ^[3]; ^[1]

Univ. of Massachusetts, Amherst, MA (United States)
Colorado School of Mines, Golden, CO (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

Random copolymers of poly(4-vinylpyridine) and polyisoprene were synthesized, and subsequently quaternized with 1-alkylbromides. The number of carbons on the pendant side-chain of the resultant comb-shaped polymer, n, ranged from 2-8. The comb-shaped polymers were crosslinked employing thiol-ene chemistry to give mechanically robust ion conducting membranes. Analysis by wide and medium-angle X-ray scattering show three morphology regimes that are dependent on the number of carbons on the pendant side-chains. When n = 2, ionomer cluster morphology was dominant, when n = 8 backbone-backbone morphology was dominant, and when n = 3-6, the membrane showed a coexistence of both ionomer cluster and backbone-backbone morphologies. Evaluation of the water uptake of the membranes showed a maximum water uptake per cation of 9.5 when n = 5 at 95% relative humidity (RH) and 60 degrees C. Finally, conductivity of the samples characterized by electrochemical impedance spectroscopy showed bromide conductivity as high as 110 mS/cm when n = 3 at 95% RH and 90 degrees C.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: US Army Research Office (ARO); USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1818453

Alternate ID(s):: OSTI ID: 1786585

Journal Information:: Journal of Polymer Science, Journal Name: Journal of Polymer Science Journal Issue: 24 Vol. 58; ISSN 2642-4150

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
anion exchange membranes
backbone-backbone morphology
dipole-dipole interactions
ionomer cluster morphology
optimization of ionic conductivity
water uptake per cation

Optimization of anionic conductivity through the coexistence of ionomer cluster and backbone-backbone morphologies in anion exchange membranes

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