Proton tunneling within the hydration structure of hydroxyl-containing perfluorosulfonate ionomer membranes

Abstract

Registry No. H02C(CH2)5C02H-4-H0C6H4C6H40H-4 copolymer, 86129-23-9; H02C(CH2)6C02H-4-H0C6H4C6H40H-4 (SRU), 74790-60-6; H02C(CH2)6C02H-4-H0C6H4C6H40H-4 copolymer, 86129-24-0; H02C(CH2)6C02H-4-H0C6H4C6H40H-4 (SRU), 74790-61-7; H02C(CH2)7C02H-4-H0C6H4C6H40H-4 copolymer, 86129-25-1; H02C(CH2)7C02H-4-H0CeH4C6H40H-4 (SRU), 86129-19-3; H02C(CH2)8C02H-4-H0C6H4C6H40H-4 copolymer, 70788-15-7; H02C(CH2)8C02H-4-H0C6H4C6H40H-4 (SRU), 70800-12-3; H02C(CH2)9C02H-4-H0C6H4C6H40H-4 copolymer, 86129-26-2; H02C(CH2)9C02H-4-H0C6H4C6H40H-4 (SRU), 86129-20-6; HO2C(CH2)10CO2H-4-HOC6H4C6H4OH-4 copolymer, 86129-27-3; HO2C(CH2)10CO2H-4-HOC6H4CeH4OH-4 (SRU), 86129-21-7; H02C(CH2)nC02H-4-H0C6H4C6H40H-4 copolymer, 86129-28-4; H02C(CH2)11C02H-4-H0C6H4C6H40H-4 (SRU), 86129-22-8; H02C(CH2)12C02H-4-H0C6H4C6H40H-4 copolymer, 86129-29-5; H02C(CH2)12C02H-4-H0C6H4C6H40H-4

Fourier transform infrared/attenuated total reflectance analysis of water diffusion in poly[styrene‐b‐isobutylene‐ b‐styrene] block copolymer membranes

“…As in the earlier similar studies, by Mauritz and Gray,30 of hydrated Nafion® membranes, the monotonic decrease in ν OH with increasing water content for these materials is attributed to an increasingly larger fraction of water molecules whose OH groups are in hydrogen bonds. It is seen that there is more hydrogen bonding in homo‐PS than in homo‐PIB.…”

State of Understanding of Nafion

“…Mauritz and Gray analyzed the IR continuous absorption of hydrated Na + OH - - and K + OH - -imbibed Nafion sulfonate membranes for the purpose of correlating this phenomenon to the current efficiency (cation transference number) of chlor-alkali electrochemical cells . In this case, the similar issue of OH - (“defect proton”) conductivity is important.…”

“…Mauritz and Gray analyzed the IR continuous absorption of hydrated Na + OH --and K + OH --imbibed Nafion sulfonate membranes for the purpose of correlating this phenomenon to the current efficiency (cation transference number) of chlor-alkali electrochemical cells. 177 In this case, the similar issue of OH -("defect proton") conductivity is important. A distinct continuous absorption appeared in the spec- tra, as seen for membranes equilibrated in different high concentrations of aqueous Na + OHand K + OH -.…”

A water sorption isotherm model for ionomer membranes with cluster morphologies

“…The total energy of this state is E2 = (H') -332/(Kx0) (13) where K is taken as 80 to account for the dipolar screening by interposed H20 molecules. Perhaps an effective K of less than 80 may be a better choice as only 1-3 H20 molecules would separate cation and anion in this state.…”

“…The fact that these molecular distinctions are indeed real has been amply demonstrated spectroscopically by Lowry and Mauritz,11 Komoroski and Mauritz,12 and Mauritz and Gray. 13 This paper attempts to factor some of these specific concepts into a simple rational model of water uptake by clustered ionomers.…”