new photostabilizers for poly (vinyl chloride) derived from heterocyclic compounds

in this work, the photo-stabilization of poly (vinyl chloride) was studied using new compounds such as schiff base stabilizers derived from heterocyclic compounds, with symbols [i1-i4] which were used as additives to prevent the pvc photodegradation. many samples have been prepared as films for this purpose by adding the additives to poly (vinyl chloride) with varying weight percentages of additives and thicknesses. the photostabilization activities for these new compounds were measured by detecting the carbonyl group with irradiation time (the absorption band of carbonyl was determined at 1724-1772 cm-1). ft-ir spectra perkin elmer speactum-65, jasco used to determine the absorption spectra of pvc films, also the viscosity average molecular weight (𝑀 ̅ 𝑣), the average number of chain scission (s), and the degree of deterioration (α) were studied. scanning electron microscope (sem) and light microscope are also used to test the polymeric films surface. we discovered that in the existence of additives, the rate of photostabilization follows the trend:- i4 i3 i1 i2 pvc according to the experimental results, a uv absorption peroxide decomposer has been proposed for mechanisms.