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

Subject Areas : Journal of the Iranian Chemical Research

Mohamamd Taghi Taghizadeh ^{1 *} , Abbas Agha Bozorgi ²

1 - Department of Physical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran
2 - Department of Physical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran

Received: 2010-01-20 Accepted : 2010-05-15 Published : 2010-12-31

Keywords: Thermal degradation, Activation energies, Copolymers, Vinyl chloride-co-Vinyl acetate, additive,

Abstract :

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