The water uptake of the BSPA–CPDA thin film showed a trend similar to that of other reported ASPIs; the results of in situ FTIR showed that when λ = 5 at 70% RH, the adsorbed water around the sulfonic acid group changes from bound water to bulk water.
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Lyotropic Liquid Crystalline Property and Organized Structure in High Proton-Conductive Sulfonated Semialicyclic Oligoimide Thin Films.
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