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Effects of a fuel cell test on the structure of irradiation grafted ion exchange membranes based on different fluoropolymers

Effects of a fuel cell test on the structure of irradiation grafted ion exchange membranes based... The role of the fluoropolymer matrix in the stability of irradiation grafted proton conducting membranes under fuel cell conditions is investigated. The structure of a series of membranes with poly(vinylidene fluoride), poly(vinylidene fluoride-co-hexafluoropropylene), poly(tetrafluoroethylene-co-hexafluoropropylene), and poly(ethylene-alt-tetrafluoroethylene) matrices with poly(styrene sulfonic acid) side chains is studied before and after a fuel cell test using X-ray scattering techniques and confocal micro-Raman spectroscopy. All tested membranes suffer from a loss of poly(styrene sulfonic acid) leading to a decrease in conductivity. Changes in crystallinity, lamellar period, orientation and thickness of the membranes are reported and compared to corresponding properties of the initial polymer films and the pristine membranes. The membranes where most severe changes in the structure of the matrix polymer can be observed have the shortest lifetimes in the fuel cell. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Electrochemistry Springer Journals

Effects of a fuel cell test on the structure of irradiation grafted ion exchange membranes based on different fluoropolymers

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References (20)

Publisher
Springer Journals
Copyright
Copyright © 2003 by Kluwer Academic Publishers
Subject
Chemistry; Physical Chemistry; Industrial Chemistry/Chemical Engineering
ISSN
0021-891X
eISSN
1572-8838
DOI
10.1023/A:1024449228157
Publisher site
See Article on Publisher Site

Abstract

The role of the fluoropolymer matrix in the stability of irradiation grafted proton conducting membranes under fuel cell conditions is investigated. The structure of a series of membranes with poly(vinylidene fluoride), poly(vinylidene fluoride-co-hexafluoropropylene), poly(tetrafluoroethylene-co-hexafluoropropylene), and poly(ethylene-alt-tetrafluoroethylene) matrices with poly(styrene sulfonic acid) side chains is studied before and after a fuel cell test using X-ray scattering techniques and confocal micro-Raman spectroscopy. All tested membranes suffer from a loss of poly(styrene sulfonic acid) leading to a decrease in conductivity. Changes in crystallinity, lamellar period, orientation and thickness of the membranes are reported and compared to corresponding properties of the initial polymer films and the pristine membranes. The membranes where most severe changes in the structure of the matrix polymer can be observed have the shortest lifetimes in the fuel cell.

Journal

Journal of Applied ElectrochemistrySpringer Journals

Published: Oct 5, 2004

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