A novel photoadditive for polyolefin photostabilization: Hindered amine light stabilizer

Hindered-amine light stabilizers were surface anchored to polyethylene and polypropylene thin films by: i) direct photo-grafting of 1,2,2,6,6-pentamet hyl piperidinyl-4-acrylate onto the surface and ii) by reacting of 1,2,2,6, 6-pentamethyl-4-piperidinol with succinic anhydride functionalized polyolef in surface. The samples were exposed to UV irradiation in air and the oxida tive-degradation of the polymers was studied with FT-IR spectroscopy. The p hoto-stability of surface anchored Hindered-amine stabilizers (HAS) was com pared with films stabilized with commercial HAS by melt blending. The resul ts of the study evince superiority of surface anchored HAS over that of mel t blended polyolefins.