Enchansing the Ionic Purity of Hydrophilic Channels by Blending Fully Sulfonated Graft Copolymers with PVDF Homopolymer.

Mads Møller Nielsen, Ami Ching-Ching Yang, Katja Jankova Atanasova, Søren Hvilsted, Steven Holdcroft

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The influence of tuning the ionic content of membranes by blending, as opposed to varying the degree of sulfonation, is evaluated. Membranes of fully sulfonated poly(vinylidene fluoride-co-chlorotrifluoroethylene)-g-poly(styrene sulfonic acid) blended with PVDF were prepared and investigated for morphology, water sorption, and proton transport properties. The blend membranes exhibit
conductivities superior to pure graft copolymers under fully humidified conditions despite their lower water uptake. Transmission electron microscopy images of the blends reveal that the membranes
comprise a combination of macro-phase segregated regions of ion-rich and PVDF-rich domains, and, at higher PVDF contents, ion-rich nano-scale domains within fluorine-rich domains.
Original languageEnglish
JournalJournal of Materials Chemistry A
Volume28
Issue number1
Pages (from-to)8071–8288
ISSN2050-7488
DOIs
Publication statusPublished - 2013

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