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• W2000495067 endingPage "2900" @default.
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• W2000495067 abstract "Water sorption properties, proton NMR spectra, and diffusion of water and protons in poly(vinylidene fluoride)-graft-polystyrene sulfonic acid (PVDF-g-PSSA) polymer electrolyte membranes were studied. Sorption curves for the membranes with different degrees of grafting in protonated and Na+ form were measured by equilibrating the membranes over saturated salt solutions. The membrane water content was found to be sensitive to changes in relative humidity (RH). The water/sulfonic acid ratio λ for the protonated samples was around 2 at 20% RH and increased to λ ∼ 30 at 100%. Proton NMR, pulsed field gradient proton NMR (PFG-NMR), and impedance measurements were made on membranes with different λ. In the proton NMR spectra only one peak was found, originating from the water in the membrane. The chemical shift of the peak was found to be dependent on the counterion and the water content. The water self-diffusion coefficients DH2O, measured by PFG-NMR, increased with degree of grafting and water content of the membranes. The proton conductivity and the calculated proton mobility decreased more steeply than the DH2O with decreasing water content. © 1999 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 37: 2893–2900, 1999" @default.
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• W2000495067 date "1999-10-15" @default.
• W2000495067 modified "2023-10-04" @default.
• W2000495067 title "Water sorption and diffusion coefficients of protons and water in PVDF-g-PSSA polymer electrolyte membranes" @default.
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• W2000495067 doi "https://doi.org/10.1002/(sici)1099-0488(19991015)37:20<2893::aid-polb9>3.0.co;2-4" @default.
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