Abstract
This study presents a kinetic analysis of the thermal decomposition of a polymeric material using numerical simulation and the Coats-Redfern method. The focus is on the three-dimensional diffusion model (D3), which reflects the diffusion-limited reaction mechanism within a volumetric structure. To evaluate the statistical stability of the kinetic parameters, the Monte Carlo method was applied with 100 iterations involving random variation of the conversion degree α. The approximation results demonstrated good agreement with experimental data, confirming the reliability of the model. The findings support the applicability of the D3 model for describing the thermal stability of the studied copolymer.