Abstract
Analytical and kinetic aspects of the photolysis and photo-oxidation of two ethylene-ethyl acrylate (EEA) copolymer samples (15 and 18 wt% EA) are described. On exposure to 254 nm radiation, the absorbing ester groups are mainly split off through Norrish I photo-reactions. Neither ketones nor alcohols are formed during the photolysis at 254 nm. Oxygen favours the disappearance of ester moieties and leads to the formation of carbonyl compounds and alcohols which appear to be hydrogen-bonded to the acrylate groups. On exposure at λ > 300 nm, the EEA copolymers appear to be more photo-oxidisable than EVA copolymers. In EEA, radical attack occurs preferentially on the carbon atom in the α position with respect to the ester groups, whereas the α position with respect to the acetate group in EVA is not an important site of attack.
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