Modeling of the polymerization and crystallization kinetic coupling of polyamide 6 synthesized from ε-caprolactam

Abstract : Optimization of polyamide 6 (PA6) composite manufacturing by liquid processes requires a better prediction of kinetics during synthesis. This study proposes a new modeling approach that considers the interaction between PA6 polymerization and crystallization over a wide temperature range (403–473 K). Different polymerization and crystallization models taken from literature were used in this study. Few attempts to describe the coupling between phenomena have been reported, and all have raised physical limitations. A new coupling equation was adapted from Hillier coupling, first introduced to model secondary crystallization of semi-crystalline thermoplastics. This equation properly predicted kinetics at high temperature when the coupling is limited. However, it failed in predicting the particular crystallization kinetics in the early stages of polymerization at low temperature, as crystallization may require that polymerized chains reach a certain length or concentration in the reactive mixture. A factor was successfully introduced in order to correct the crystallization behavior. From this new model, a wide isothermal Time-Temperature-Transformation (TTT) diagram was produced, which assists in cure path design for composite manufacturing.
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Journal articles
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Submitted on : Monday, August 5, 2019 - 2:36:58 PM
Last modification on : Friday, October 11, 2019 - 8:23:02 PM

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Céline Vicard, Olivier de Almeida, Arthur Cantarel, Gérard Bernhart. Modeling of the polymerization and crystallization kinetic coupling of polyamide 6 synthesized from ε-caprolactam. Polymer, Elsevier, 2019, 180, pp.art. n° 121681. ⟨10.1016/j.polymer.2019.121681⟩. ⟨hal-02263670⟩

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