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Crystallization of polypropylene at high cooling rates: Microscopic and calorimetric studies

Abstract : The use of three different calorimeters made it possible to measure the overall kinetics of isotactic polypropylene in the α-phase in a wide temperature range. Original results concerning the growth rate of α spherulites were also obtained by optical microscopy by using a prototype hot stage developed in our laboratory. A new growth regime seems to exist at low crystallization temperature. The number of nuclei shows a smooth evolution with temperature with no rupture in the nucleation behavior in the low-temperature range. Combination of experimental results and an appropriate extrapolation procedure lead to an overall kinetics law valid in the whole domain of existence of the α-phase. This law is based on Ozawa's formalism. It will be used in polymer processing.
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Submitted on : Monday, March 26, 2012 - 5:24:49 PM
Last modification on : Wednesday, October 20, 2021 - 3:18:29 AM

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Séverine A.E. Boyer, Phil Robinson, Pierre Ganet, Jean-Philippe Melis, Jean-Marc Haudin. Crystallization of polypropylene at high cooling rates: Microscopic and calorimetric studies. Journal of Applied Polymer Science, Wiley, 2012, 125 (6), pp.4219-4232. ⟨10.1002/app.36578⟩. ⟨hal-00682771⟩

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