A simplified approach for the lifetime prediction of PE in nuclear environments

Polyethylene stabilization against thermal oxidation by a trimethylquinoleine oligomer

“…On the contrary, molar mass of polyethylene stabilized with a sufficient HAS amount undergoes a slight downward trend during the induction period but without any catastrophic decrease [38]. The critical value M F ¼ 70 kg mol À1 corresponds to an end-oflife criterion as proposed by Khelidj et al [47] and confirmed by Fayolle et al [34]. Let us note that 0.2% of Irganox 1010 is probably of the order of the solubility limit and an excess of stabilizer would not display the expected efficiency.…”

Polyethylene loss of ductility during oxidation: Effect of initial molar mass distribution

“…Samples were studied as 15 μm thick films in order to avoid the complications linked to the so called Diffusion Limited Oxidation [11,12]. Films were obtained by blown-film extrusion with a single screw extruder (25 mm diameter, 20D) at 30 rpm, under a temperature profile between 200 and 240°C, a 50 mm diameter blown die, 0.8 die gap and an air cooling device.…”

Thermo-oxidative aging of epoxy coating systems

“…In a study of polyethylene insulating materials exposed in these conditions, Khelidj et al [1] proposed a kinetic approach which can be widely generalized. It is based on the graph of Fig.…”