Influence of thermal history on the mechanical properties of poly(ether ketone ketone) copolymers
TypeArticles dans des revues avec comité de lecture
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 (I) with different T/I ratios were assessed at room temperature and above their glass transition temperature depending on the thermal history during processing. The influence of cooling conditions and macromolecular modifications at high exposure temperatures was investigated. Results show that modulus and yield properties for a given testing temperature follow a master curve driven mainly by crystallinity regardless of the PEKK copolymers. By modifying PEKK during exposures at 400°C, which leads to branching mechanisms before crystallization, it is shown that modified PEKKs follow the master curve, thus confirming the predominant role of crystallinity in small deformation properties. However, for some morphologies, depending on the crystallization conditions such as cold or melt crystallization, a slight deviation is observed from the global master curve.
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A more reliable DSC-based methodology to study crystallization kinetics: Application to poly(ether ketone ketone) (PEKK) copolymers CHOUPIN, Tanguy; FAYOLLE, Bruno; RÉGNIER, Gilles; PARIS, Christophe; CINQUIN, Jacques; BRULÉ, Benoît (Elsevier Ltd, 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 ...
CHOUPIN, Tanguy; FAYOLLE, Bruno; REGNIER, Gilles; PARIS, C.; CINQUIN, Jacques; BRULÉ, Benoît (Elsevier, 2017)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 ...
CHOUPIN, Tanguy; BRULE, Benoît; CINQUIN, Jacques; REGNIER, Gilles; FAYOLLE, BRUNO (elsevier, 2018)Macromolecular modifications of 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 above its melting ...
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