Investigation on thermal degradation behavior of typical thermoplastics polymer

Thermo Gravimetric Analyzer was used to study the thermal degradation of polypropylene,polyethylene and poly(methyl methacrylate) at three different heating rates under air atmosphere.The TG and DTG data were employed to reveal the degradation processes and the effect of the heating rates on degradation process of PP,PE and PMMA.The thermal degradation kinetics models were obtained through the Coats-Redfern method,then the degradation mechanisms and effect of oxygen on degradation processes were discussed,at last the reliabilities of the thermal degradation kinetics models were proved by comparing the experimental and calculated TG data.