Aging of magnesium stearate under high doses gamma irradiation and oxidative conditions

Lebeau, D.; Beuvier, L.; Cornaton, M.; Miserque, F.; Tabarant, Michel; Esnouf, S.; Ferry, M.

doi:10.1016/j.jnucmat.2015.02.016

Cited by 10 publications

(8 citation statements)

References 27 publications

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“…For off-line gas analyses, polymers were irradiated in the form of stacks of thin films inserted in 20 cm 3 (8 cm 3 for 36 Ar ion beams) sealed glass ampoules, under He. The resulting radiolysis gases were analyzed using a quantitative gas mass spectrometer (MAT-271; Thermo Fisher, a direct inlet gas mass spectrometer with a magnetic sector), with a detection limit of about 1 ppm, depending on the gas matrix and mass interferences …”

Section: Methodsmentioning

confidence: 99%

“…The resulting radiolysis gases were analyzed using a quantitative gas mass spectrometer (MAT-271; Thermo Fisher, a direct inlet gas mass spectrometer with a magnetic sector), with a detection limit of about 1 ppm, depending on the gas matrix and mass interferences. 46 To evaluate and correct the impact of the difference in dosimetry on G H 2 , two identical polymers were irradiated simultaneously with electron beams for on-line analyses and in sealed glass ampoules with γ rays for of f-line analyses. The same procedure was applied for on-line analyses with Ne beams and of f-line analysis with Ar beams.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen Emission and Macromolecular Radiation-Induced Defects in Polyethylene Irradiated under an Inert Atmosphere: The Role of Energy Transfers toward trans-Vinylene Unsaturations

et al. 2016

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This article is aimed at studying the evolution of H release as well as radiation-induced defects in polyethylene (PE), as a function of the irradiation dose under anoxic conditions. We analyze the influence of the energy transfers and trapping toward radiation-induced defects on the evolution of the radiation chemical yields with dose. One key objective herein is to quantify the contribution of these transfers toward trans-vinylene (TV) on H emission. For this purpose, pure PE was irradiated in a large dose domain and H emission was compared to that in predoped PEs containing chemically inserted TV groups irradiated at low doses. In parallel, evolutions of the concentrations of the TV groups and minor defects (vinyl and trans-trans-diene) as a function of dose were considered. Moreover, measuring simultaneously H and unsaturated groups had allowed inferring the cross-linking evolution with dose. With this methodology, we have succeeded in quantifying the efficiency of TVs and cross-links as energy traps and, using simple models, in fully describing the evolution of all of the radiation chemical yields. Besides, irradiations were performed using either low linear energy transfer irradiations (electron beams, γ rays) or ion beams, with the objective to assess the influence of the high ionization and excitation densities induced by the latter on PE ageing and energy transfer processes.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrogen Emission and Macromolecular Radiation-Induced Defects in Polyethylene Irradiated under an Inert Atmosphere: The Role of Energy Transfers toward trans-Vinylene Unsaturations

et al. 2016

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“…These effects could be attributed to hydrogen atom abstraction on DINP by PVC radicals (mainly peroxyl derivatives) formed under gamma radiation rather than the classical propagation by autooxidation. Lebeau et al, 2015). In addition, in a more recent study, the same types of by-products were identified by GC-MS during the radiooxidation of calcium stearate (Lebeau et al, 2017).…”

Section: 2radiooxidation Products Identification After Solvent Extrac...mentioning

confidence: 80%

Additives as a major source of radiolytic organic byproducts of polyvinyl chloride (PVC)

Chantreux

Ricard

Asia

et al. 2021

Radiation Physics and Chemistry

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“…Hence, a second irradiation has to be performed, at doses as low as possible in comparison to the initial dose in order to keep the material signature. The use of this two-step irradiation protocol has already been presented in previous articles [ 32 , 33 , 34 ] and has many advantages. For instance, when a polymer is irradiated under an oxidative atmosphere, radicals are formed and react with oxygen—the well-known radio-oxidation.…”

Section: Methodsmentioning

confidence: 99%

“…Gas analyses were performed using a high resolution gas mass spectrometer from Thermo Fischer Scientific (MAT-271) [ 34 ]. This mass spectrometer is equipped with a ionization chamber in which gas ionization is realized through electron impact.…”

Section: Methodsmentioning

confidence: 99%

Radio-Oxidation Ageing of XLPE Containing Different Additives and Filler: Effect on the Gases Emission and Consumption

2021

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In the lifetime extension of nuclear power plants (NPPs) context, aging of electric cables has to be very well understood in order to predict their end-of-life and thus to replace them on time. Therefore, evaluation and understanding of the ageing mechanism of the cable insulating material is mandatory under conditions as close as possible of those encountered in NPPs. In this context, different formulated crosslinked polyethylenes (XLPE)—one of the polymers used nowadays to manufacture the insulator layer—have been irradiated under oxidative conditions, at two different dose rates and at different aging doses. Gases emitted and consumed from the irradiated polymers were quantified to identify the primary processes happening in the materials and thus the interactions involved between the different molecules composing the formulated polymers.

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Aging of magnesium stearate under high doses gamma irradiation and oxidative conditions

Cited by 10 publications

References 27 publications

Hydrogen Emission and Macromolecular Radiation-Induced Defects in Polyethylene Irradiated under an Inert Atmosphere: The Role of Energy Transfers toward trans-Vinylene Unsaturations

Hydrogen Emission and Macromolecular Radiation-Induced Defects in Polyethylene Irradiated under an Inert Atmosphere: The Role of Energy Transfers toward trans-Vinylene Unsaturations

Additives as a major source of radiolytic organic byproducts of polyvinyl chloride (PVC)

Radio-Oxidation Ageing of XLPE Containing Different Additives and Filler: Effect on the Gases Emission and Consumption

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