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• W2022710195 endingPage "2858" @default.
• W2022710195 startingPage "2848" @default.
• W2022710195 abstract "An in-depth analysis for proton exchange membranes to examine the effects of acid concentration and effective proton mobility upon proton conductivity as well as their relationship to water content was carried out on two main-chain, statistically sulfonated polymers at 25 °C. These polymer systems consisted of poly(ethylenetetrafluoroethylene-graft-polystyrenesulfonic acid) (1) and sulfonated trifluorostyrene (BAM) membrane (2). Nafion (3) was used for comparison. Water content (as represented by Xv, the water volume fraction, where Xv = volume of water in hydrated PEM ÷ volume of hydrated PEM), for each sample was varied by adjusting the relative humidity (RH) of the membrane environment from 50% to 98%. It was found that, at low RH (RH < 70%), the major factor determining proton conductivity is proton mobility. In order to remove the differences in acid strength for the membranes, proton mobility values at infinite dilution (Xv = 1.0) and 25 °C were calculated and found to be 2.6 ± 0.2 × 10-3 (average of 1a−c), 1.6 ± 0.3 × 10-3 (average of 2a−e), and 2.32 ± 0.01 × 10-3 cm2 s-1 V-1 (3). These were then compared to the theoretical value for the mobility of a free proton at infinite dilution and to previously reported data. Possible differences in tortuosity and the juxtaposition of acid groups are proposed in order to account for the significant deviations of all samples from the theoretical value." @default.
• W2022710195 created "2016-06-24" @default.
• W2022710195 creator A5059000496 @default.
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• W2022710195 date "2008-02-21" @default.
• W2022710195 modified "2023-10-16" @default.
• W2022710195 title "Relationships of Acid and Water Content to Proton Transport in Statistically Sulfonated Proton Exchange Membranes: Variation of Water Content Via Control of Relative Humidity" @default.
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• W2022710195 doi "https://doi.org/10.1021/jp077218t" @default.
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