Abstract:

The photo-oxidation ageing process of PVC-coated membrane material was studied by artificial accelerated ageing test using different intensities of UV irradiation. The Yellowness index was tested during the experiments. FTIR and UV-Vis spectrometry were used to analyze the results. It was found that the photo-oxidation mechanism didn’t change under different UV intensities, but the ageing degree of the samples was not equivalent when the cumulative UV radiation energy was the same. It’s because the photo-oxidation reaction rate under different intensities is out of proportion to UV intensity. So the reciprocity law does not apply to buil PVC’s life prediction model, but better correlation between ageing results of sample under different UV intensities can be obtained according to Schwarzschild’s law.