Abstract
Photocrosslinking of ethylene–propylene–diene terpolymer (EPDM), and photo- and thermo-oxidative degradation of photocrosslinked EPDM have been studied by photoacoustic Fourier transform infrared spectroscopy (PAS-FTIR), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). The relative ratios of degradation to crosslinking for photocrosslinked EPDM by swelling measurement were estimated by Charlesby's random crosslinking theory to be 0.06 for EPDM 4770 and 0.1 for EPDM 4045. The PAS-FTIR and XPS data gave the evidence that the surface photo- and thermo-oxidation degradation of photocrosslinked EPDM samples with a given UV irradiation time apparently increase with aging time. The main photo-oxidation products were identified as hydroperoxides and various carbonyl compounds. The SEM measurements show that the photo-oxidative degradation of photocrosslinked EPDM has a crucial effect compared with thermo-oxidative degradation.
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