Abstract
AbstractThe kinetic crystallization model of Avrami is generally accepted as a starting point for the analysis of isothermal polymer crystallization. It is shown in this paper that, in the case of non‐isothermal crystallization kinetics with constant heating or cooling rates, an apparent m‐order reaction model is approximately equivalent to the nucleation and growth model of Avrami in the vicinity of the inflection points of the corresponding crystallization curves. Since the apparent m‐order reaction model is defined for every real, positive apparent reaction‐order m, a distinct Avrami index n, which is valid for the characterization of isothermal and non‐isothermal crystallization experiments with constant heating or cooling rates, can always be related to any apparent reaction‐order m. Therefore, two types of Avrami master curves, which are dependent merely on the Avrami index n and which describe the isothermal polymer crystallization thoroughly, can be obtained by performing non‐isothermal experiments with constant heating or cooling rates.
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