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Some coordination complexes of Ni(II), Cu(II), Zn(II), Cd(II) and Sn (II) metal with [4amino-5-(pyridyl)-4H-1,2,4-triazole-3-thiol], has been prepared in alcoholic medium and used for photostabilizer for polystyrene. Polystyrene (PS) has been mixed with these complexes in chloroform solvent to form modified PS in (5%) w/v thickness, which containing concentration of complex 0.5 % by weight were produced by the casting method from chloroform solvent. The photostabilization of PS films compounds was investigated. The light of the wavelength 365 nm with intensity (6.02*10 9 Ein Dm -3 S -1 ) is used for irradiation of PS films at room temperature. The photostabilization activity of these compounds was determined by calculating the photodecomposition rate constant (Kd) for blank and modified polystyrene.

Ultra violet spectra studies of polystyrene films in presence of some transition metal complexes with 4-amino-5-pyridyl)-4h-1,2,4-triazole-3-thiol