Phenomenological models for the isothermal physical aging of PEEK. Issue 12 (December 2018)

• Record Type: Journal Article
• Authors: Hermida, Élida Beatriz; Arenas, Claudio Daniel
• Is Part Of: Heliyon. Volume 4:Issue 12(2018)
• Publication Date: 2018-12
• Subjects: Mechanical engineering -- Materials science; Research -- Periodicals; Medical sciences -- Periodicals; Natural history -- Periodicals; Social sciences -- Periodicals; Earth sciences -- Periodicals; Physical sciences -- Periodicals; 507.2
• DOI: 10.1016/j.heliyon.2018.e01018
• Languages: English
• ISSNs: 2405-8440

Abstract

Abstract: Creep test is a useful tool to study thermal aging and deformation mechanisms of semi-crystalline polymers, such as polyether-ether-ketone (PEEK). Hou and Chen proposed a power law to fit creep data of PEEK aged at different temperatures and the master curve built from those data. This paper attempts to complement that analysis by introducing Kohlrausch function as an alternative to the fractional Maxwell's model associated to the power law. Although the fitting of experimental data and the mathematical conditions imposed to equations that describe curves that can be superimposed by translations, are obeyed by both models, this paper demonstrates that Kohlrausch function provides a better phenomenological description of the creep response of PEEK due to the physical interpretation of the fitting parameters and their dependence on the aging time and temperature.