Differential scanning calorimetry has been found useful in studying the kinetics of the Tg. The method commonly used involves annealing the polymer at temperatures below Tgfor various periods of time and then measuring the enthalpy change in going from the glassy to the liquid state as a function of annealing time and temperature. However, annealing below Tgis a slow process, and therefore the quantity of research that can be done by this method is limited. Moreover, the above method measures primarily the kinetics of the annealing process. We are also interested in the kinetics of the transition from the glass to the liquid state.