Methodology for multistage degradation of polyimide polymer

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Abstract

Six methods were used to study the thermal degradation of a thermoset bismaleimide resin. These investigated methods are those of Kissinger, Ozawa, Horowitz-Metzger, Coats-Redfern, MacCallum-Tanner and van Krevelen. The degradation kinetics of the resin was measured by thermogravimetric analysis (TGA) at different heating rates. TGA experiments were performed in order to elucidate the thermal behavior and supplied the data that suggest a degradation process. This methodology describes the degradation stages not only with different activation energies or pre-exponential factors but also with different reaction orders. Mathematical verification of the methodology showed that the MacCallum-Tanner and Coats-Redfern methods are more precise and kinetic parameters of K736 thermal degradation in an inert atmosphere are calculated.

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