Effect of gamma irradiation on tensile properties of low molecular weight polyethylene samples
TypeArticles dans des revues avec comité de lecture
Three high density polyethylene (PE) samples of different origins, with weight average molar masses ranging from 38 to 63kgmol-1 and displaying a semi-ductile behavior with strain at break εR values of the order of 100-140%, were gamma irradiated under nitrogen for doses up to 33.3kGy. Steric exclusion chromatography and rheometry allowed to quantify the crosslink density X. This later reached values ranging from 4.6 to 9.0×10-3molkg-1, i.e. situated below the gelation point. Differential calorimetry, density measurement and small angle X-rays scattering showed the absence of significant changes in the crystalline morphology, especially lamellar dimensions. Tensile testing revealed an unexpected trend towards brittle regime of fracture while yield stress increases significantly at low doses. It appeared that branching disfavors cavitation during yielding, but this effect is not favorable to ductility.
Showing items related by title, author, creator and subject.
RICHAUD, Emmanuel; FERREIRA, Paulo; AUDOUIN, Ludmila; COLIN, Xavier; VERDU, Jacques; MONCHY-LEROY, Carole (Elsevier Ltd., 2010)Thin (60 μm) and thick (250 μm) samples of poly(ether ether ketone) were subjected to radiochemical ageing at 24 kGy h -1 dose rate for doses up to 30.7 MGy at 60 °C in air. FTIR spectrophotometry (hydroxyl and carbonyl ...
RICHAUD, Emmanuel; COLIN, Xavier; MONCHY-LEROY, Carole; AUDOUIN, Ludmila; VERDU, Jacques (Society of Chemical Industry, 2011)The radiochemical degradation of bisphenol A polysulfone was investigated under a γ-ray dose rate of 24 kGy h-1 up to 30.7 MGy total absorbed dose at 60 °C using gel permeation chromatography, sol-gel analysis, glass ...
COLIN, Xavier; RICHAUD, Emmanuel; VERDU, Jacques; MONCHY-LEROY, Carole (Elsevier, 2010)A non-empirical kinetic model has been built for describing the general trends of radiooxidation kinetics of ethylene-propylene copolymers (EPR) at low γ dose rate and low temperature. It is derived from a radical chain ...
SHABAN, Amin; COLIN, Xavier; MARQUE, Gregory; MONCHY-LEROY, Carole (Rubber Division of the American Chemical Society, 2014)The considerable amount of research in the literature has practically allowed the elucidation of the mechanism of peroxide cross-linking of ethylene–propylene–diene–monomer rubber (EPDM), which occurs through a radical ...
Thermo-oxidation behaviour of composite materials at high temperatures: A review of research activities carried out within the COMEDI program LAFARIE, Marie Christine; GRANDIDIER, Jean Claude; OLIVIER, Loic; COLIN, Xavier; VERDU, Jacques; CINQUIN, Jacques (Elsevier, 2010)The present paper presents a review of the main activities carried out within the context of the COMEDI research program, a joint collaboration involving three research teams focusing on the thermo-oxidation behaviour of ...