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Abstract Explanations of the deviations of polymer crystallisation isotherms from Avrami equations are considered in the light of the assumptions inherent in the derivation of the equations and analysis of the crystallisation isotherms; these explanations are rejected. Modified equations which allow for the presence of several crystallisation mechanisms and recrystallisation are considered to be a more satisfactory physical model of spherulitic crystallisation from the melt. While they describe the crystallisation isotherms more accurately than a single Avrami process, non‐random deviations which cannot be satisfactorily explained still exist. Further modifications to include changing nucleation characteristics, induction periods, etc., do not improve the fit of these modified equations.
J. N. Hay (Mon,) studied this question.