rosulfonic acid (PFSA) ionomers, Nafion®, the 3M PFSA polymer, and the C-2 side-chain polymer originally developed by Dow, with side chains –O-(CF2CF(CF3)-O- (CF2)2SO3H, –O-(CF2)4-SO3H, and –O-(CF2)2-SO3H respectively. The materials were heated above the Tg and the reorganization of the polymer morphology was studied in situ on the nanoscale by SAXS using synchrotron Proton exchange membranes were cast from three radiation. It was shown that both the 3M and the side-chain membranes are much more crystalline and featured than the Nafion® membrane. The membranes were then hydrated at 80, 100, and 120ºC, with a humidified gas stream (80ºC dew point), and the kinetics of the morphological changes studied. In general the SAXS features increased in intensity as the ionomer peak grew in and swelled. Various heteropoly acid additives were also added to the membrane which was found to suppress the ionomer peak.
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