The thermal degradation of net polymethacrylates

Abstract

The thermal degradation of net polymethacrylates has been investigated over a wide temperature range under dynamic and static heating conditions. The relationship between thermal and thermodynamic stability was obtained by the combined use of experimental thermogravimetric data and theoretical thermodynamic calculations. The thermodynamic examination of net polymer pyrolysis allowed the prediction of the direction of reaction. An equilibrium depolymerization reaction scheme has been suggested to obtain the thermodynamic parameters of polymerization of net polymethacrylates from equilibrium concentration data. The kinetic parameters for the elementary reactions of the depolymerization of the polydimethacrylates investigated were obtained from an assumed kinetic model. This model allows the correlation of the kinetic parameters between the net fragments and randomly distributed linear fragments in polydimethacrylates.