Abstract
The vibrational spectra of Nafion ® membranes with alkaline earth cations as counterions have been obtained by photoacoustic infrared spectroscopy (PAS–IR) and Fourier transform Raman spectroscopy (FT-Raman). The symmetrical stretching band of the sulfonate group (∼1060 cm −1) decreases with increasing atomic mass of the countercation, excepting for Mg 2+, in both techniques. The thermal behavior of Nafion membranes by means of differential scanning calorimetry (DSC) curves showed a dependence on the water content and a similar profile between Nafion-Mg 2+ and -Ca 2+, and between Nafion-Sr 2+ and -Ba 2+, for the first scanning curve. An ageing effect was also observed on Nafion by DSC curves. High-resolution thermogravimetry (TG) curves under nitrogen atmosphere showed similar decomposition profiles. It was determined from TG curves that there is a decreasing water content with increasing ionic radius of cation, and the thermal stability increasing from Nafion-Mg 2+ to -Ba 2+.
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