Multiscale study of poly(butylene terephthalate) hydrolysis
Article dans une revue avec comité de lecture
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.
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Article dans une revue avec comité de lectureLOYER, C.; RÉGNIER, Gilles; DUVAL, V.; OULD, Y.; RICHAUD, Emmanuel (Elsevier, 2020)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 ...
Article dans une revue avec comité de lectureDEFAUCHY, Virginie; LE GAC, Pierre Yves; GUINAULT, Alain; VERDU, Jacques; RECHER, Gilles; DROZDZAK, Renata; RICHAUD, Emmanuel (Elsevier, 2017)The in situ thermal oxidation of thin unstabilized polydicyclopentadiene was studied by TGA to monitor mass gain, and DSC to characterize hydroperoxides concentration. Results were discussed using kinetic analysis, which ...
ROMP of novel hindered phenol-functionalized norbornenes and preliminary evaluation as stabilizing agents† Article dans une revue avec comité de lectureNICOLAS, Clémence; HUANG, Jing; RICHAUD, Emmanuel; MINNE, Wendy; DROZDZAK, Renata; RECHER, Gilles; FONTAINE, Laurent; MONTEMBAULT, Véronique (Elsevier, 2021)A series of new norbornene monomers containing sterically hindered phenol groups have been synthesized and polymerized via ring-opening metathesis polymerization (ROMP) using the Grubbs 3rd generation catalyst (G3’). ROMPs ...
Chapitre d'ouvrage scientifiqueHUANG, Jing; RICHAUD, Emmanuel; LE GAC, Pierre-Yves; DAVID, Adelina; DROZDZAK, Renata; GILLES, Recher (Elsevier, 2020)Polydicyclopentadiene (PDCPD) is a thermoset polymer synthetized from Ring Opening Metathesis Polymerization and produced by Reaction Injection Moulding process. Due to its interesting properties, like short processing ...
Article dans une revue avec comité de lectureHUANG, Jing; MINNE, Wendy; DROZDZAK, Renata; RECHER, Gilles; LE GAC, Pierre Yves; RICHAUD, Emmanuel (Elsevier, 2020)Thin unstabilized PDCPD film were thermally oxidized in ovens at several temperatures ranging from 50 °C to 120 °C. Hydroperoxide concentration was monitored by DSC. It was observed that hydroperoxides concentration reaches ...