GAS PHASE COMBUSTION STUDIES OF POLYMERS IN THE MICROSCALE COMBUSTION CALORIMETER

摘要

The microscale combustion calorimeter (MCC) is a standard test (ASTM D 7309) tornmeasure the flammability potential of materials in terms of parameters associated withrnthermal decomposition (pyrolysis) of the solid and complete oxidation of the volatilerndecomposition products. In the present work the temperature of the MCC combustionrnfurnace was reduced from 1273K in 50K increments until incomplete combustion of thernpyrolysis gases was observed during the 10-second residence time. The concentration ofrnoxygen (O2), carbon monoxide (CO) and carbon dioxide (CO2) exiting the combustor werernmeasured as a function of combustor temperature for a variety of common polymers andrnbromine containing, flame retardant plastics. The thermal environment in the combustor wasrncharacterized and a constant effective temperature was calculated in order to obtain globalrnkinetic parameters for isothermal oxidation of the pyrolysis gases. The global activationrnenergies for oxidation of the pyrolysis gases varied between 50 and 200 kJ/mole for thernpolymers of this study, with lower values observed for heat resistant and halogenatedrn(hydrogen deficient) polymers.