Photooxidation of polyphasic ethylene-propylene polymers

摘要

The oxidation photoproducts resulting from the UV irradiation of a polyphasic polymer P-E/EPR in conditions of artificial accelerated exposure have been identified by different analytical methods. These methods included FTIR analysis of the polymeric matrix coupled with derivatization reactions. The identification of the low molecular weight photoproducts was carried out by chromatography and mass spectroscopy analysis. It was shown that the oxidation photoproducts were those of the polypropylene phase, which is by far the most oxidizable. Moreover our results showed unambiguously that the formation of the photoproducts was resulting from the oxidation of the tertiary carbon atom, which is consistent with the expected reactivities.