A molecular model for flow induced crystallization of polymers

Arnaud Poitou (1) , Amine Ammar (1)

1 LMT - Laboratoire de Mécanique et Technologie

We present in this paper a thermodynamic model for flow induced crystallization of a thermoplastic. The thermomechanical framework (generalized standard materials) allows us to couple in a very natural way the kinetics of crystallization with the mechanical history experienced by the thermoplastic[1]. In describing the viscoelastic properties of the polymer with a molecular theory, we obtain a model for flow-induced crystallization that couples the chain conformation to the kinetics of crystallization. This model intends to be valid both for shearing and elongation. We present the equations for two cases: Maxwell and Pom-Pom constitutive equations. We finally illustrate our model with injection molding simulations achieved with a dedicated Finite Element code.

Domaines: Matière Condensée [cond-mat]

Arnaud Poitou, Amine Ammar. A molecular model for flow induced crystallization of polymers. Macromolecular Symposia, 2002, Flow-Induced Crystallization of Polymers 185 (1), pp.243-255. ⟨10.1002/1521-3900(200208)185:1<243::AID-MASY243>3.0.CO;2-S⟩. ⟨hal-01004850⟩