Abstract
The effects of X-ray radiation on Nafion-117 membrane were investigated by electron paramagnetic resonance spectroscopy (EPR), photoacoustic infrared spectroscopy (PAS), Raman scattering and ultraviolet-visible electronic absorption spectroscopy. EPR spectrum of irradiated Nafion membrane reveals the presence of peroxy free radical similar to that found in irradiated polytetrafluoroethylene. The Raman and infrared (IR) spectra of irradiated samples show the appearance of new bands at 1458, 1700 and 1773 cm −1, that can be associated with the presence of C=O and C=C groups. In addition, Raman and IR spectra show a band intensity change associated with the stretching modes of C–O, C–S and SO 3-, indicating scissions of C–S and C–O bonds and SO 2 liberation. UV-Vis spectra of irradiated samples exhibit bands at 196, 230 and 273 nm, whose intensities increase with irradiation doses and with aging time.
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