Dynamic rheological behavior of poly(ether ketone ketone) from solid state to melt state

• Published in: Journal of applied polymer science Vol. 135; no. 27; pp. 1 - n/a
• Main Authors: Coulson, Mike, Quiroga Cortés, Luis, Dantras, Eric, Lonjon, Antoine, Lacabanne, Colette
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc 15.07.2018; Wiley
• Subjects: Activation energy; Aromatic compounds; Condensed Matter; Engineering Sciences; Ketones; Loss modulus; Materials; Materials Science; Mechanical analysis; mechanical properties; Parallel plates; Physics; Polyaryletherketones; Polymers; Rheological properties; rheology; Solid state; Storage modulus; structure–property relationships; thermoplastics; Torsion; Viscosity; viscosity and viscoelasticity; Mechanical properties; Viscosity and viscoelasticity; Thermoplastics; Structure–property relationships; Rheology
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.46456

ABSTRACT High performance thermoplastic poly(ether ketone ketone) (PEKK) polymers with various meta phenyl links ratio were investigated by dynamical mechanical analysis. Analyses were carried out in a wide range of temperature from solid state (torsion rectangular mode) to the melt state (torsion parallel plates mode) as function of thermal history and environmental conditions. In the solid state, this study was focused on the secondary relaxations in the vitreous state. A complementary investigation conducted with different poly(aryl ether ketones) allowed us to propose a molecular interpretation of PEKK sub‐vitreous relaxations. In the molten state, storage modulus (G′), loss modulus (G″), storage viscosity (η′), and loss viscosity (η″) were studied to determine zero shear‐rate viscosity (η0) and thermal activation energy Ea. Master curves were built and the shift factor aT was determined. Thermal activation energies were extracted from an Arrhenius model on the shift factor temperature's dependency. Finally, Ea and η0 were determined thanks to the dynamic viscosity fit with Cross model and Cole–Cole representation. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46456.