Photo stabilization of PVC films by using some novel tetra Schiff's bases derived from1,2,4,5-tetra-[5-amino-1,3,4-thiadiazole-2-yl]-benzene

Abstract

A five new Schiff's bases namely 1,2,4,5-tetra[-5-arylidene-1,3,4-thiadiazole-2-yl]-benzene are synthesized by condensation of 1,2,4,5-tetra-[5-amino-1,3,4-thiadiazole-2-yl]-benzene with four equivalent of appropriate aromatic aldehyde in ethanol. The compounds are characterized by analytical and spectral means. The activity of these compounds in photostabilization of PVC is investigated using FTIR and UV-VIS Spectrophotometeric techniques. All these additives were act as stabilizer in PVC film. The following trend is obtained for the photostabilization effect of PVC films in the presence of these additives. SP < SH< SM< SN< SO According to the experimental results obtained, a propose mechanism was suggested depending on the structure of the additive