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A molecular model for flow induced crystallization of polymers
Author(s) -
Poitou Arnaud,
Ammar Amine
Publication year - 2002
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200208)185:1<243::aid-masy243>3.0.co;2-s
Subject(s) - crystallization , materials science , shearing (physics) , viscoelasticity , constitutive equation , polymer , thermodynamics , flow (mathematics) , thermoplastic , finite element method , kinetics , polymer science , mechanics , composite material , polymer chemistry , classical mechanics , physics
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.