Induced Photodegradation of Poly (Vinyl Chloride) by using Cobalt (II) – Complex [Co (C20H26N6O4)]Cl2

Abstract

Photo degradation process for polymers is very important method to treatment the waste of polymeric materials since it provides quick and safe termination of this waste with lowest costs in addition to the minimization of harmful effects on the environment rather than other ways This study adopts the safe acceleration of Photodegradation of the plastic west which is made from poly (vinyl Chloride) , by adding metallic complexes of divalent cobalt with ligands of Mannich bases , complex prepare M1 = [Co(C20H26N6O4)Cl2 added to the poly ( vinyl chloride ) films which made with 70±5 µm thickness , with weight percentage ratios ( 0.025 , - , 0.4). Both pure and with additives films are expose to ultra violet radiation with 365 nm. Wave length, 18 watt power with period starting with 20 hours, and ended at 120 hours. The ultra-violet measurement U.v-Vis, infrared measurement FT-IR techniques are used to study the Photodegradation process by calculate the degradation speed constant Kd, noting growth of both the carbonyl index ICo and hydroxyl IOH index. Also monitor the change with the average molecular weight of films during irradiance periods. The ultra-violet results it can show that, the degradation speed constant Kd is direct proportional with the irradiance time and the concentrations of the additives. While the results of infrared measurement illustrate, the growth of carbonyl index and hydroxyl index are direct proportional with irradiance time and also with the concentration of additives. But the growth of carbonyl index ICo is associated with the great change during the irradiance periods, than the hydroxyl index IOH. The viscosity measurements show, the average molecular weight is inversely proportion with each of the irradiance time, and the concentration of additives. Also by calculation of degradation degree α, and numerical average of chain cutting S, proves that, there are cross-linking and the chain breaking occurs randomly.