Isothermal crystallization kinetic modeling of poly(etherketoneketone) (PEKK) copolymer
Article dans une revue avec comité de lecture
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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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Article dans une revue avec comité de lectureCHOUPIN, Tanguy; PARIS, Christophe; CINQUIN, Jacques; BRULÉ, Benoît; REGNIER, Gilles; FAYOLLE, Bruno (Elsevier, 2018)To quantify the isothermal crystallization kinetics of poly(ether ketone ketone) (PEKK), the integration of the crystallization peak measured using differential scanning calorimetry is rendered difficult due to the thermal ...
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Article dans une revue avec comité de lectureDEBERTRAND, Louis; PARIS, Christophe; CINQUIN, Jacques; BRULÉ, Benoît; REGNIER, Gilles; FAYOLLE, Bruno (Wiley, 2019)Since poly(ether ketone ketone) (PEKK) is a good candidate as a matrix for composite structural parts, the mechanical properties of PEKK copolymers prepared from diphenyl ether, terephthalic acid (T), and isophthalic acid ...
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Article dans une revue avec comité de lectureCHERRI, Alexis; ILIOPOULOS, Ilias; BRULÉ, Benoit; LÉ, Guillaume; TENCÉ-GIRAULT, Sylvie; REGNIER, Gilles (American Chemical Society (ACS), 2022-03-08)High-temperature laser sintering (HT-LS) is a very promising additive manufacturing process for the production of parts of complex geometry for highly demanding applications. Poly(aryl ether ketone) polymers such as ...
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