Oxygen consumption in EPDM irradiated under different oxygen pressures and at different LET

Stability Efficiencies of POSS and Microalgae Extracts on the Durability of Ethylene-Propylene-Diene Monomer Based Hybrids

“…The kinetic approach on the degradation of ethylene-propylene elastomers stated that the molecular scission followed by the competitive crosslinking versus oxidation explained the structural changes of ethylene-propylene elastomers, where the major role of diene in the development of oxidation state is determinative in detail [ 36 , 43 ]. During γ-irradiation, the oxygen consumption depends linearly on the square root of O 2 [ 24 ]. Accordingly, the contribution of diffused oxygen during degradation can be minimized by the addition of the appropriate compounds (antioxidants and/or fillers) that prevent material aging.…”

“…The degradation of EPDM has been extensively studied [ 20 , 21 , 22 , 23 ] due to its functional performances and abroad spectrum of industrial and commodities applications. The manufacture of high-performance EPDM products must avoid the excessive consumption of oxygen because the generation of peroxyl radicals, their decay by the autocatalytic degradation (the reaction P· + POO·) or bimolecular recombination (POO· + POO·) [ 24 ], promotes degradation. As it was previously demonstrated for the oxidation of EPDM, the heating rate may profoundly influence the thermal resistance of this polyolefin [ 25 ].…”

Effect of oxygen on gas emitted from polymer irradiated using Swift Heavy Ion beams

“…Figure 4 shows that in case of polyolefins, carbon dioxide radiation chemical yield decreases when the stopping power increases. Dély, Ngono-Ravache, Ramillon and Balanzat [33] have shown on an EPDM that oxidation is effective at high stopping power, but that the rate of oxygen uptake decreases when LET increases. Authors have attributed this phenomenon to the radicals formed in the ion track which will tend to recombine with each other rather than react with the embedded oxygen.…”

Diffusion‐controlled radiochemical oxidation of bisphenol A polysulfone

“…Hence, for a dose rate of 24 kGy h −1 : r OX ≈ 9.5 × 10 −7 mol L −1 s −1 . The radiochemical yield for oxygen consumption would thus be of the order of36 where I is the dose rate (Gy s −1 ). G OX is hence let us recall that samples were irradiated under 1.5 bar (150 kPa) air pressure.…”