Cinétique de cristallisation en refroidissement rapide et sous pression de polymères thermoplastiques

Cinétique de cristallisation en refroidissement rapide et sous pression de polymères thermoplastiques

Nicolas Boyard Baptiste Pignon Vincent Sobotka Didier Delaunay 

Laboratoire de Thermique et Energie de Nantes, UMR 6607 CNRS Université de Nantes, La Chantrerie, rue Christian Pauc CS 50609, 44306 Nantes cedex 3

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The accurate knowledge of heat transfer in forming processes is of high importance to predict shrinkage, deformations and residual stresses of a thermoplastic part. The use of a semi-crystalline polymer induces a transformation, which directly influences the part quality in terms of mechanical properties and geometrical tolerances. The process simulation requires the determination of thermo-physical properties and the crystallization kinetics since they are strongly coupled, but also the boundary conditions at the surface of the part, in relevant processing conditions. In this framework, we present in this paper, from three complementary devices, a study describing the characterization of polypropylene crystallization in high cooling and pressure conditions, and the evolution of the thermal contact resistance between this polymer and the mould.


crystallization, kinetics, thermoplastics, rapid cooling

Extended abstract
1. Introduction
2. Étude de la cinétique de cristallisation par FDSC sur une large gamme de températures
3. Transferts de chaleur et cristallisation à la surface d’une pièce thermoplastique mise en forme par injection
4. Identification de la cristallisation sous pression par le dispositif « PvT-XT »
5. Conclusions

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