Abstract
Several investigations have indicated that proton conduction and hydration properties of acidic ionomers differ from those of membranes. However, relations between the OH- conductivity and water uptake in thin film forms of anion exchange membranes have not been reported yet. For this study, new in situ measurements were established to elucidate the OH- conductivity and water uptake without allowing any influence of CO2 from the air. Poly[(9,9-bis(6'-(N,N,N-trimethylammonium)-hexyl)-9H-fluorene)-alt-(1,4-benzene)], denoted as PFB+ , was synthesized as a model ionomer. The highest OH- conductivity of 273 nm-thick PFB+ film was 5.3×10-2 S cm-1 at 25 °C under 95 % relative humidity (RH), which is comparable to the reported OH- conductivity of PFB+ membrane. Reduced OH- conductivity was found in the thinner film at 95 % RH. The decreased OH- conductivity is explainable by the reduced number of water molecules contained in the thinner film. The OH- conductivity was reduced only slightly under the same water uptake.
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