Polyethylene loss of ductility during oxidation: Effect of initial molar mass distribution
Article dans une revue avec comité de lecture
Date
2018Journal
Polymer Degradation and StabilityAbstract
This paper reports a study of thermal oxidation induced embrittlement in several polyethylene grades differing mainly by the broadness of the molar mass distribution (ranging for lower than 3 to more than 30). Thermal oxidation was monitored at macromolecular scale (Gel Permeation Chromatography, Differential Scanning Calorimetry) and macroscopic scale (tensile tests). As expected, the samples undergo predominant chain scission and plastic deformation is suppressed below a critical molar mass value (M’C). Even though this latter was previously reported to be independent of the initial weight average molar mass, it is shown here that it depends on initial polydispersity index. Samples were also shown to undergo chemicrystallization, i.e. that segments released by chain scissions migrate into the crystalline phase with a yield increasing with initial polydispersity index. Finally, the main novelty of this work is to evidence that the previously proposed end-of-life criteria at macromolecular level linked to loss of ductility (critical molar mass, crystallization yield) depend on the initial polydispersity index.
Files in this item
Related items
Showing items related by title, author, creator and subject.
-
Article dans une revue avec comité de lectureDJOUANI, Fatma; VERDU, Jacques; FLACONNECHE, Bruno;
FAYOLLE, Bruno;
RICHAUD, Emmanuel (Institut Français du Pétrole, 2015)
This paper deals with polymer-fuel interaction focusing on specific effects of biofuels on polyethylene (PE) in automotive applications. The practical objective is to develop a predictable approach for durability of ... -
Article dans une revue avec comité de lectureThis article deals with polypropylene stabilization by hindered 2,6-di-tert-butylphenols. Two aspects are mainly considered: the influence of stabilizer structure, of its concentration and temperature on induction period ...
-
Chapitre d'ouvrage scientifiqueAs soon as it appeared on the market, one half century ago, polypropylene (PP) appeared as a promising fibre-forming polymer but with some difficulties in processing due to a lack of control of its viscoelastic properties ...
-
Co-oxidation kinetic model for the thermal oxidation of polyethylene-unsaturated substrate systems Article dans une revue avec comité de lectureThe thermal oxidation of polyethylene (PE) impregnated by the methyl esters of unsaturated fatty acids (UFEs) was studied using chemiluminescence, and infra-red spectrophotometry. It was shown that the presence of UFEs ...
-
Article dans une revue avec comité de lectureOKAMBA-DIOGO, Octavie; VERDU, Jacques; GUILMENT, Jean; FERNAGUT, François;
FAYOLLE, Bruno;
RICHAUD, Emmanuel (Elsevier, 2013)
The literature on oxidation kinetics of polyamides and model compounds has been reviewed in order to try to extract suitable information for non-empirical kinetic modeling. Polyamide characteristics are systematically ...