If one considers the KJMA exponent from the standpoint of volumetric changes, a relative effect obtainable from the thermomechanical measurements becomes worth investigating.
approximation of continuous temperature-time curves by subsequent isothermal steps, with each step (N) obeying the isothermal KJMA kinetics.
By simple algebra, taking logarithms twice to reduce the equation to the traditional KJMA notation, one obtains
Previous attempts to apply the extension of isothermal KJMA kinetics to the nonisothermal case for polymeric materials differ from our approach in two aspects.
Application of the modified KJMA analysis to the nonisothermal and isothermal experiments is shown in Figs.