Kinetic studies of polystyrene using non - isothermal degradation by TGA

Abstract

The kinetic analysis was carried out for thermal degradation by using of Thermo gravimetric analysis TGA analysis of polystyrene (PS 120) produced by Sabic company , using models of Flynn-Wall-Ozawa , Friedman, Kissinger , Coats-Redfern, dynamic, and Horowitz-Metzger methods. Activation energy was determined . The experiments were conducted at five heating rates of 5,10,15,20,25 Co/min. The temperature range of 30 - 775 Co under helium as inert gas was used with flow rate 20 ml/min . The obtained activation energy dependences are interrupted, the thermal degradation which follows random scission pathway, average activation energy obtained was 230 KJ/mol . This value was compared with published data and was found in a good agreement.