Effect of some additives on degradation of poly (vinyl chloride- co- vinyl

Abstract

The thermal decomposition of 86 % vinyl chloride 14 % vinyl acetate copolymer was<br />studied by the conductometry technique in the presence of nitrogen. The kinetics of stability and<br />thermal degradation of vinyl chloride- co- vinyl acetate (PVC- co- PVAc) copolymer with<br />copper, copper oxide and tricalcium dicitrate (st) were investigated at various temperatures (150-<br />180 oC ) in solution. The rate coefficients for the degradation of the copolymer were determined.<br />The energies of activation, determined from the temperature dependence of the rate coefficients<br />for copolymer alone was 63.536 kJ mol-1 and in the presence of copper, copper oxide and<br />tricalcium dicitrate were 44.224, 55.594 and 110.332 KJ mol-1, respectively. The results show<br />that thermal stability was increased in the presence of tricalcium dicitrate, but its thermal<br />stability was decreased in the presence of copper and copper oxide.