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Isothermal crystallization kinetic modeling of poly(etherketoneketone) (PEKK) copolymer

Article dans une revue avec comité de lecture
Author
CHOUPIN, Tanguy
244009 Airbus Group Innovations [Suresnes]
PARIS, C.
244009 Airbus Group Innovations [Suresnes]
CINQUIN, Jacques
244009 Airbus Group Innovations [Suresnes]
BRULÉ, Benoît
238410 Arkema
ccREGNIER, Gilles
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
ccFAYOLLE, Bruno

URI
http://hdl.handle.net/10985/11597
DOI
10.1016/j.polymer.2017.01.033
Date
2017
Journal
Polymer

Abstract

Isothermal melt and cold crystallizations of a poly(etherketoneketone) (PEKK) copolymer prepared from diphenyl ether (DPE), terephthalic acid (T) and isophthalic acid (I) with a T/I ratio of 60/40 have been investigated by differential scanning calorimetry, wide-angle X-ray scattering and polarized optical microscopy. For the first time, the two-stage overall crystallization kinetics of PEKK taking into account effects of nucleation and crystal growth has been identified by using a modified Hillier type model. The primary crystallization stage is found to be an instantaneous two dimensional nucleation growth with an Avrami exponent of 2 whereas the secondary stage is found to be an instantaneous one dimensional nucleation growth with an Avrami exponent of 1. The evolution of the crystallization kinetic constants for two-stage crystallizations has been modeled according to the Hoffman and Lauritzen growth theory. Due to low crystallization kinetics, a crystallization induction time has been added to obtain a good fit with experimental data. Based on this modeling, Time-Temperature-Transformation (TTT) diagrams of the relative volume crystallinity have been established for the overall crystallization mechanism and also for the separated primary and secondary crystallization mechanisms providing an original crystallization mapping of the material.

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