Spectroscopic and photochemical stability of polystyrene films in the presence of metal complexes

Abstract

Five metal complexes containing Ni(II), Cu(II), Zn(II), Cd(II) and Sn (II) metals and 4-amino-5-(pyridine-4-yl)-4H-1,2,4-triazole-3-thiol have been prepared for use as polystyrene photostabilizers. The additives (0.5% by weight) were mixed with polystyrene in chloroform to produce modified PS using the casting method. PS films were irradiated (λ = 250â380 nm) with a light absorption intensity of 6.02 Ã 10â9 ein dmâ3 sâ1 at room temperature. The photostabilization activity of the films was determined by monitoring various changes, such as the carbonyl index, hydroxyl index, weight loss, viscosity average molecular weight, surface morphology and quantum yield of the chain scission. Keywords: Polystyrene films, Metal complexes, Photostabilization, 4-Amino-5-(pyridin-4-yl)-4H-1,2,4-triazole-3-thiole, Quantum yiel