Effect of Barium stearate on the thermal stability of polyvinyl chloride

摘要

Thermal degradation reaction kinetics of PVC stabilized by barium stearate were studied by means of the non-isothermal weight-loss technique under a nitrogen atmosphere. The results show that the lowest decomposition temperature is greater than 203.6°C and 217.2°C in the conversion rate of 5% and 10% respectively. When the heating rate β is 10°C/min, at 200°C and 225°C the remaining mass from the sample with barium stearate was 99.1% and 95.3%, respectively. The thermal decomposition process occurred in three stages, the results calculated by various methods show that the average apparent activation energy in first, second and third phase is 79.88 kJ/mol, 89.37 kJ/mol and 187.34 kJ/mol respectively. In the initial reaction (α＜18%), as heating rate is 20°C/min, the decomposition reaction is controlled by the (A1.5) mechanism.