PHOTO-HYDROPEROXIDATION AND GRAFTING OF POLYOCTENAMER - ACCESS TO NEWPOLYMERIC-HINDERED AMINE STABILIZERS

Polyoctenamer reacts with singlet oxygen to produce polymeric pendant hydroperoxide groups. Anthracene was used as a sensitizer for producti on of singlet oxygen under 365 nm irradiation. Remarkable differences were observed when the reaction was performed in the solid state or in the solution. Hydroperoxidation in the solution was much slower than in the film, and only pendant hydroperoxides were produced. Conversely , two processes take place in the film. One is the ''ene'' reaction of singlet oxygen with double bonds producing hydroperoxides as in the s olution; the second one is a radical process producing both carbonyl p roducts and additional hydroperoxides. This process went on after anth racene was completly consumed. Irradiation (lambda > 300 nm) of hydrop eroxidized polyoctenamer solution in the presence of monomers ( 2,2,6, 6-tetramethyl or 1,2,2,6,6-pentamethyl-4-piperidyl acrylate) or stable nitroxyl radicals ( earoyloxy-2,2,6,6-tetramethyl-4-piperidyl-4-N-oxy l or TEMPO) grafted these monomers or stable radicals onto the polyoct enamer. Light stabilizing efficiency of grafted and low molecular addi tives was tested in polyoctenamer. (C) 1977 John Wiley & Sons, Inc.