Abstract
Polycarbonate (PC)/acrylonitrile-butadiene-styrene (ABS) polymer alloy/montmorillonite (MMT) nanocomposites were prepared using a direct melt intercalation technique. The pyrolytic degradation and the thermo-oxidative degradation of the polymer alloy and the nanocomposites were studied by thermogravimetric analysis (TGA). The kinetic evaluations were performed by the model-free kinetic analysis and the multivariate non-linear regression. Apparent kinetic parameters for the overall degradation were calculated. The results show that PC/ABS/MMT nanocomposites have high thermal stability and low flammability. Their pyrolytic degradation and the thermo-oxidative degradation model are different. The pyrolytic degradation reaction of the polymer is a two-step parallel reaction model: nth-order reaction model, and ath-degree autocatalytic reaction with an nth-order reaction autocatalytic reaction, whereas the thermal oxidative degradation reaction of the polymer is a two-step following reaction model: A !B ! Co fnth-order reaction model, and autocatalytic reaction model. Copyright # 2005 John Wiley & Sons, Ltd.
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