https://sam.ensam.eu:443 The DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material. Thu, 14 May 2026 11:10:11 GMT 2026-05-14T11:10:11Z http://hdl.handle.net/10985/19359 PBT plasticity loss induced by oxidative and hydrolysis ageing LOYER, C.; DUVAL, V.; OULD, Y.; REGNIER, Gilles; RICHAUD, Emmanuel 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. Wed, 01 Jan 2020 00:00:00 GMT http://hdl.handle.net/10985/19359 2020-01-01T00:00:00Z LOYER, C. DUVAL, V. OULD, Y. REGNIER, Gilles RICHAUD, Emmanuel 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. http://hdl.handle.net/10985/20802 Multiscale study of poly(butylene terephthalate) hydrolysis LOYER, C.; DUVAL, V.; REGNIER, Gilles; RICHAUD, Emmanuel This paper reports the hydrolysis of several PBT materials (pigmented or not). Degradation was monitored by gel permeation chromatography (chain scission), DSC (crystalline morphology), tensile test (residual mechanical properties) and DVS (polymer-water interaction). The embrittlement comes from chain scission associated with a small chemicrystallization effect. Results lead to the proposal of a kinetic model for the chain scission rate aimed to describe the auto-acceleration effect induced by carboxylic acids (chain ends) and successfully compared to results both from this work or literature. The mixed “average molar mass – crystallinity” criterion proposed in a previous paper was specified. At last, the effect of pigments is illustrated and shows that carbon black (presesterbatch) plays an aggravating role on hydrolysis. Fri, 01 Jan 2021 00:00:00 GMT http://hdl.handle.net/10985/20802 2021-01-01T00:00:00Z LOYER, C. DUVAL, V. REGNIER, Gilles RICHAUD, Emmanuel This paper reports the hydrolysis of several PBT materials (pigmented or not). Degradation was monitored by gel permeation chromatography (chain scission), DSC (crystalline morphology), tensile test (residual mechanical properties) and DVS (polymer-water interaction). The embrittlement comes from chain scission associated with a small chemicrystallization effect. Results lead to the proposal of a kinetic model for the chain scission rate aimed to describe the auto-acceleration effect induced by carboxylic acids (chain ends) and successfully compared to results both from this work or literature. The mixed “average molar mass – crystallinity” criterion proposed in a previous paper was specified. At last, the effect of pigments is illustrated and shows that carbon black (presesterbatch) plays an aggravating role on hydrolysis.