Influence of hygrothermal conditioning on the chemical structure and thermal mechanical properties of aliphatic polyketone. (September 2020)

• Record Type: Journal Article
• Authors: Lin, Harrison; Pearson, Adam; Kazemi, Yasamin; Kakroodi, Adel; Hammami, Ahmed; Heydrich, Marcus; Xu, Bo; Naguib, Hani E.
• Is Part Of: Polymer degradation and stability. Volume 179(2020)
• Publication Date: 2020-09
• Subjects: Polyketone -- Thermoplastic -- Hygrothermal degradation -- Thermal degradation -- Chemical degradation -- Mechanical properties -- FTIR; Polymers -- Deterioration -- Periodicals; Stabilizing agents -- Periodicals; Polymères -- Dégradation -- Périodiques; Stabilisants -- Périodiques; 668.9
• DOI: 10.1016/j.polymdegradstab.2020.109260
• Languages: English
• ISSNs: 0141-3910

Abstract

Abstract: Hygrothermal conditioning on the chemical, thermal and mechanical properties of aliphatic polyketone terpolymer, ethylene-propylene-carbon monoxide (EPCO), were investigated under high temperature fluid transport conditions. The DSC results suggest the effect of hygrothermal treatment and exposure time on the advancement of chain scission leading to an increase in crystallinity induced by chemi-crystallization, which was confirmed by FTIR results. TGA results of EPCO correspond to reductions of thermal stability with decreases in T5% and Tmax characteristic temperatures by 19% and 10%, respectively. The yield stress, stiffness and dynamic storage modulus increased with degradation time. However, decreases in the elongation at break were observed after prolonged periods of degradation due to the embrittlement resulting from polymer chain scission. Highlights: Prolonged hygrothermal degradation of Polyketone results to chain scission phenomenon. Thermal stability declines with increased in hygrothermal degradation conditioning. Mechanical property and performance declined arising from changes in crystallinity. Prolonged degradation retained better mechanical properties at elevated temperatures from dynamic mechanical tests.