Diagramme TTT isotherme de la polymérisation anionique du PA6 à partir de l’ε-caprolactame

Diagramme TTT isotherme de la polymérisation anionique du PA6 à partir de l’ε-caprolactame

Céline Vicard Olivier De Almeida Arthur Cantarel Gérard Bernhart* 

Institut Clément Ader (ICA), Université de Toulouse, CNRS, Mines Albi, UPS, INSA, ISAE Campus Jarlard, Route de Teillet, F-81013 Albi Cedex 09, France

Corresponding Author Email: 
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30 June 2018
| Citation



Adaptation of liquid reactive process for composite thermoplastic manufacturing has been studied through the polyamide 6 case. Its polymerisation from the ε-caprolactam monomer involves simultaneously the crystallisation of the growing chains over the temperature range. In order to understand and predict the coupling between both phenomena, an experimental study of PA6 synthesis has been achieved in isothermal conditions by means of DSC technique. Different shapes of curves have been obtained, depending of the level of coupling between polymerisation and crystallisation. The final degree of conversion, characterised by TGA, has been recorded between 92 and 97 wt.%, indicating a high reaction yield. The crystalline phase obtained has been characterised by DSC and WAXS. The samples showed a high crystallinity of α-type form. This database has been used as input for the development of a kinetic model of PA6 synthesis. Polymerisation was described by Malkin’s model and crystallisation by Nakamura’s model. The Hillier’s coupling has been adapted to the polymerisation/crystallisation case by adding a correction factor, allowing a better prediction of each mechanism. Thanks to this model, the isothermal TTT diagrams of the PA6 synthesis has been established.


liquid reactive process, thermoplastic composite, synthesis kinetics, coupling modelling, DSC

Extended abstract
1. Introduction
2. Étude expérimentale de la synthèse
3. Modélisation du couplage polymérisation/cristallisation
4. Conclusion

Les auteurs tiennent à remercier Brüggemann Chemical, Germany pour avoir gracieusement fourni les produits de cette réaction.


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