An extended multi-step kinetic model for thermal degradation of ceramizable polymer

The pyrolysis and oxidation processes of a phenolic resin modified with boron carbide–containing talc (B₄C talc) in N₂ and air atmospheres were studied, and an accurate kinetic model was established. Non-isothermal pyrolysis experiments were conducted on the modified boron phenolic resin at different heating rates using a thermogravimetric analyzer, and the results show that there are three main causes for the weight change of the modified resin: volatilization of small molecules, pyrolysis of the boron-phenolic resin, and oxidation of the inorganic fillers. In the kinetic analysis, an extended kinetic deconvolution was developed to describe the complex pyrolysis and oxidation of the modified resin, including weight gain reactions and weight loss reactions. Deconvolution based on pyrolysis and oxidation further enhances the plausibility and coherence of this method, and the goodness of fit of the thermogravimetric curve was found to be greater than 0.98.