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The thermal degradation of MMA–St random copolymer and EPS lost foams was studied by thermal
gravimetric analysis (TGA) oxygen atmospheres and the results were compared with nitrogen one. The
stabilizing effect of oxygen on thermal degradation of both foams and consequently possible mechanism
was investigated. The activation energy was calculated under nitrogen and oxygen atmospheres by the
Flynn–Wall–Ozawa method as a reliable way of determining the kinetic parameters. In this study the
correlation method and isokinetic relationship (IKR) were used to estimate a model-independent preexponential
factor (ln A) corresponding to a given degree of conversion under both atmospheres.
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