Abstract
N-substituted maleimides have been investigated as photo-stabilizers for rigid PVC by measuring the rate of dehydrochlorination, the extent of discoloration, the amount of gel formation as well as the intrinsic viscosity of the soluble fractions of the degraded polymer. The results reveal a higher stabilizing efficiency for the products investigated relative to the industrially used phenyl salicylate UV absorber. A greater efficiency is similarly observed on comparison with dibutyl tin maleate which was originally used as a thermal stabilizer. The stabilizing efficiency is influenced by the nature and position of substituents in the aryl rings of the maleimide derivatives. A synergistic effect is achieved when the maleimides are mixed with the UV absorber phenyl salicylate in equimolar ratios. A radical mechanism is proposed to account for the stabilizing action of the products investigated.
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