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Metallocene Polypropylene Crystallization Kinetic During Cooling in Rotational Molding Thermal Condition

Article dans une revue avec comité de lecture
Author
SARRABI, Salah
14421 Laboratoire d'Ingénierie des Matériaux [LIM]
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
BOYER, S.A.E
224097 Département Technologie des Polymères et Composites & Ingénierie Mécanique [TPCIM]
LACRAMPE, Marie-France
224097 Département Technologie des Polymères et Composites & Ingénierie Mécanique [TPCIM]
KRAWCZAK, Patricia
224097 Département Technologie des Polymères et Composites & Ingénierie Mécanique [TPCIM]
TCHARKHTCHI, Abbas
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]

URI
http://hdl.handle.net/10985/8057
DOI
10.1002/app.39035
Date
2013
Journal
Journal of Applied Polymer Science

Abstract

This article is part of an ambitious project. The aim is to simulate mechanical properties of rotomolded part from micro-structure consideration. Main objective here is to consider metallocene polypropylene crystallization kinetic (PP) during cooling stage in rotational molding. Crystallization kinetic of metallocene PP is so rapid that microscopy cannot help to observe nucleation and growth. Crystallization rate can be estimated by a global kinetic. Given that cooling in rotational molding is dynamic with a constant rate, Ozawa law appears more appropriate. Ozawa parameters have been estimated by differential scanning calorimetry. In rotational molding thermal condition, Avrami index identifies a complex nucleation intermediate between spontaneous and sporadic. Ozawa rate constant is 68 times higher than this obtained for Ziegler–Natta PP. By coupling transformation rate from Ozawa model and a thermal model developed earlier, the difference between theory and experimental is less than 1%. To optimize rotational molding, study has been completed by sensitivity to adjustable parameters.

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