PBT plasticity loss induced by oxidative and hydrolysis ageing. (November 2020)

• Record Type: Journal Article
• Authors: Loyer, C.; Régnier, G.; Duval, V.; Ould, Y.; Richaud, E.
• Is Part Of: Polymer degradation and stability. Volume 181(2020)
• Publication Date: 2020-11
• Subjects: Polybutylene terephthalate -- Embrittlement -- Crystallinity -- Molar mass -- Hydrolysis -- Thermal ageing; Polymers -- Deterioration -- Periodicals; Stabilizing agents -- Periodicals; Polymères -- Dégradation -- Périodiques; Stabilisants -- Périodiques; 668.9
• DOI: 10.1016/j.polymdegradstab.2020.109368
• Languages: English
• ISSNs: 0141-3910

Abstract

Highlights: Study of PBT thermal and hydrolytic ageinginducing plasticity loss. Study of molar mass decrease induced by chain scissions. Study of crystalline changes (annealing and chemicrystallization). Proposal of a mixed (Mw, xC) failure criterion separating ductile and brittle behavior. Abstract: This paper reports the study of embrittlement of PBT submitted either to thermal or hydrolytic ageing. All changes were followed up by tensile tests, rheometry in molten state and gel permeation chromatography for molar mass changes, SAXS and DSC experiments for crystallinity changes. Both kind of ageing were shown to induce predominant chain scissions with moderate crystallinity increase, in great part due to annealing. The combination of all results were used to establish a Mw - χc embrittlement window helping for a determination of an end of life criterion.