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Rheological and crystallization behaviors of low processing temperature poly(aryl ether ketone)

Abstract : A new low melting temperature poly(aryl ether ketone) (PAEK) thermoplasticpolymer (Victrex AE 250) was investigated through thermal and rheologicalanalysis of films and flakes. DSC was assigned to evaluate the influence ofcooling rate on crystallinity and thermal transitions. Rheometry was used toassess its flowing behavior through the evaluation of dynamic moduli andcomplex viscosity in the melted state. The relaxation times were found fromthe rheological curves: they are between a few ms to 200 ms for AE 250, lowerthan those found for PEEK 450, meaning a faster mobility of macromolecules.The thermal activation energy,Eaobtained from Time Temperature Superposi-tion is the same for films and flakes in spite of a lower viscosity for flakes. Themolecular weight between entanglements is evaluated at 8000 g.mol1forFMc and 13,000 for FLc, it is compared to the value of about 2000 g.mol1found for PEEK 450 with the same procedure. Also, the viscosity was com-pared to other commercial PAEK such as PEEK and PEKK based on data fromthe literature. This polymer appears very efficient to compete with high perfor-mance thermoplastics to be processed by compression molding, out of auto-clave consolidation, additive manufacturing, and welding.
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Submitted on : Thursday, September 9, 2021 - 1:54:10 PM
Last modification on : Thursday, September 9, 2021 - 2:31:29 PM

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Margot Bonmatin, France Chabert, Gérard Bernhart, Toufik Djilali. Rheological and crystallization behaviors of low processing temperature poly(aryl ether ketone). Journal of Applied Polymer Science, Wiley, 2021, 138 (47), pp.51402. ⟨10.1002/app.51402⟩. ⟨hal-03304519⟩

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