In this work the thermal degradetion of poly(styrene sulfone) has been studied by differential scanning calorimeter (DSC) and thermogravimetric analyzer (TGA). Poly-(styrene sulfone) shows a two-step degradation mechanism

the initial degradation occuring in the temperature range 120-200℃ and major degradation taking place at higher temperature. Isothermal degradation of poly(styrene sulfone) .has also been studied. Above 270 ℃ the kinetics of the thermal degradation are first order with an activation energ of 14 KCal/mol.