Thermally cross-linked anion exchange membranes from solvent processable isoprene containing ionomers

Tsung Han Tsai, S. Piril Ertem, Ashley M. Maes, Soenke Seifert, Andrew M. Herring, E. Bryan Coughlin

Research output: Contribution to journalArticlepeer-review

62 Scopus citations


Random copolymers of isoprene and 4-vinylbenzyl chloride (VBCl) with varying compositions were synthesized via nitroxide-mediated polymerization. Subsequent quaternization afforded solvent processable and cross-linkable ionomers with a wide range of ion exchange capacities (IECs). Solution cast membranes were thermally cross-linked to form anion exchange membranes. Cross-linking was achieved by taking advantage of the unsaturations on the polyisoprene backbone, without added cross-linkers. A strong correlation was found between water uptake and ion conductivity of the membranes: conductivities of the membranes with IECs beyond a critical value were found to be constant related to their high water absorption. Environmentally controlled small-angle X-ray scattering experiments revealed a correlation between the average distance between ionic clusters and the ion conductivity, indicating that a well-connected network of ion clusters is necessary for efficient ion conduction and high ion conductivity.

Original languageEnglish (US)
Pages (from-to)655-662
Number of pages8
Issue number3
StatePublished - Feb 10 2015

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© 2015 American Chemical Society.


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