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Materials 2021, 14, 1617 11 of 20 Figure 6. Dimensional stability of the cross-linked diblock ionomer membranes in water. A Nafion 117 membrane is included for comparison. Materials 2021, 14, x FOR PEER REVIEW 12 of 20 FiFgiguurere7.7D.Dimimenesnisoinoanlasltsatbaibliitlyityofotfhtehcerocrsoss-lsi-nliknekdedidbliobclokcikonionmoemremremebmrabnreasneinspinupreumreemtheatnhoalnol (2(92.97.7MM).)A.ANNafaifioonn11177mmeemmbbraranneeisisininclculuddeeddfoforrcocommppaarirsiosonn.. Figure 8. Dimensional stability of the cross-linked diblock ionomer membranes in pure ethanol (20.6 Figure 8. Dimensional stability of the cross-linked diblock ionomer membranes in pure ethanol M). A Nafion 117 membrane is included for comparison. (20.6 M). A Nafion 117 membrane is included for comparison. Figures 9 and 10 show, respectively, the methanol and ethanol permeabilities of the Figures 9 and 10 show, respectively, the methanol and ethanol permeabilities of the cross-linked diblock ionomer membranes and a Nafion 117 as functions of alcohol concen- cross-linked diblock ionomer membranes and a Nafion 117 as functions of alcohol con- tration. The measured methanol and ethanol permeabilities of Nafion117 in 1M alcohols centration. The measured methanol and ethanol permeabilities of Nafion117 in 1M alco- are 1.17 × 10−6 and 2.9 × 10−6 cm2·s−1, respectively, and are in good agreement with the hols are 1.17 × 10−6 and 2.9 × 10−6 cm2s−1, respectively, and are in good agreement with the literature values. Except for the A50G4S-10 membrane, the cross-linked diblock membranes literature values. Except for the A50G4S-10 membrane, the cross-linked diblock membranes generally showed much greater alcohol resistance than the Nafion 117 membrane. The rela- generally showed much greater alcohol resistance than the Nafion 117 membrane. The tively poor showing of the A50G4S-10 membrane could be attributed to excessive swelling relatively poor showing of the A50G4S-10 membrane could be attributed to excessive swell- caused by a higher proportion of sulfonic acid groups in this ionomer. In these Figures, ing caused by a higher proportion of sulfonic acid groups in this ionomer. In these Figures, alcohol permeability of Nafion 117 presents an obvious increasing trend compared to the alcohol permeability of Nafion 117 presents an obvious increasing trend compared to the other membranes in question with the increase in alcohol concentration. other membranes in question with the increase in alcohol concentration.PDF Image | Hydrophilic Cross-Linked Aliphatic Hydrocarbon Diblock Copolymer
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