Abstract
Terpolymers of ethylene, propylene and ethylidene norbornene (EN) rapidly react with singlet oxygen generated by dye sensitization. The singlet oxygen attacks the ethylidene double bond forming at least two different allylhydroperoxides. The instability of these hydroperoxides causes crosslinking of the photo-oxidized terpolymers at relatively low temperatures. Reduction of the hydroperoxide groups with triphenylphosphine yields a thermally stable hydroxylated polymer. Terpolymers of ethylene, propylene and dicyclopentadiene (DCPD) are inert towards singlet oxygen.
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