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【摘要】Thermogravimetric study of rubber compositions(operating glove and catheter)in medical waste was carried out using the thermogravimetric analyser(TGA),at the heating rate of 20°C/min in a stream of N2.The results indicate that the decomposition process of operating glove appears an obvious mass loss stage at 250 485°C,while catheter has two obvious stages at 240 510°C and 655 800°C,respectively;both samples present endothermic pyrolysis reaction;the decomposition of operating glove and the first mass loss stage of catheter are in agreement with natural rubber pyrolysis;the second mass loss stage of catheter corresponds to CaCO3decomposition.Based on the experimental results,a novel two-step four-reaction model was established to simulate the whole continuous processes,which could more satisfactorily describe and predict the pyrolysis processes of rubber compositions,being more mechanistic and conveniently serving for the engineering.