Stabilising effect of monomers,homopolymers and copolymers of vinyl derivatives of sterically hindered amines on the photo-oxidation of polypropylene

Vinyl derivatives of sterically hindered amines, N-(2,2,6,6-tetramethyl-4-piperidyl)methacrylamide, 2,2,6,6-tetramethyl-4-piperidyl acrylate and methacrylate and 1,2,2,6,6-pentamethyl-4-piperidyl acrylate and methacrylate were prepared. Monomers, homopolymers and copolymers with dodecyl methacrylate (DMA) and octadecyl acrylate (ODA) were tested as stabilisers of the photo-oxidation of polypropylene film. The copolymers exhibited higher efficiency and lower extractability. The photostabilising efficiency increased in the order: homopolymer < monomer < copolymer with DMA < copolymer with ODA.