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The thermal behavior of Nafion-117 membranes was investigated by thermogravimetric analysis (TG) and differential scanning calorimetry (DSC). TG measurements revealed that the mechanism of thermal degradation of a Nafion membrane in the acid form is different from that of Nafion in the sodium form. The DSC curves for the first heating, for both acid and salt forms, display two endothermic peaks, near 120 and 230°C. The high-temperature peak was assigned to the crystalline domains melting in Nafion, and the low-temperature peak was attributed to a transition into ionic clusters, since this transition exhibits significant changes depending on the nature of the counterion and the degree of hydration.

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, J. Wang , J. Ai Chemical Engineering Journal 2015 , 270 , 73 – 79 “ Nafion-H-catalyzed high-temperature/high-pressure synthesis of a triarylmethane in continuous-flow mode ” S. Hayden , T. Glasnov and C. O. Kappe

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data of PFSIs is rather vague and inconsistent due to the complexity of the molecular structure and the diversity of segmental motions in the ionomers [ 18 ]. DSC studies of dry Nafion H-type PFSI membranes have revealed two endothermic peaks between

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