Abstract
The growth rate of isotactic polypropylene is deduced from microscopic observations during isothermal crystallizations. A change in the growth regime is observed at 138 ‡C and interpreted as a Regime III → Regime II transition, according to Hoffman's kinetic theory of polymer crystallization. A Regime II → Regime I transition is also theoretically predicted at 155 ‡C, i. e. at a temperature outside the investigated temperature range. The Regime III → Regime II transition is related to the positive to negative change in the spherulite birefringence, which is generally attributed to a change in the organization of crystalline lamellae: quadritic arrays of intercrossing lamellae atT c < 138 ‡C (Regime III) and preferentially radiating lamellae atT c > 138 ‡C (Regime II). It is suggested that such a morphological change could be interpreted using the concept of “non-adjacent re-entry” introduced in Hoffman's kinetic theory. This interpretation could also explain the interspherulitic ruptures observed in negative spherulites.
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Monasse, B., Haudin, J.M. Growth transition and morphology change in polypropylene. Colloid & Polymer Sci 263, 822–831 (1985). https://doi.org/10.1007/BF01412960
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DOI: https://doi.org/10.1007/BF01412960