Kinetics of thermal degradation and thermal oxidative degradation of poly( p-dioxanone)

Abstract

The kinetics of the thermal degradation and thermal oxidative degradation of poly( p-dioxanone) (PPDO) were investigated by thermogravimetric analysis. Kissinger method, Friedman method, Flynn–Wall–Ozawa method and Coats–Redfern method have been used to determine the activation energies of PPDO degradation. The results showed that the thermal stability of PPDO in pure nitrogen is higher than that in air atmosphere. The analyses of the solid-state processes mechanism of PPDO by Coats–Redfern method and Criado et al. method showed: the thermal degradation process of PPDO goes to a mechanism involving random nucleation with one nucleus on the individual particle ( F 1 mechanism); otherwise, the thermal oxidative degradation process of PPDO is corresponding to a nucleation and growth mechanism ( A 2 mechanism).