Radiochemical ageing of epoxy coating for nuclear plants
Article dans une revue avec comité de lecture
The degradation of an epoxy-amine network exposed to gamma irradiation in oxygen atmosphere has been studied by using a variety of analytical methods, including infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and sol-gel analysis. Results show that the oxidation of epoxy systems grows with the irradiation dose. Hydroperoxides, which are species resulting from oxidation, were identified and quantified by DSC. As indicated by the sol-gel analysis, the mechanism of degradation of chain scission seems to be predominant over crosslinking. The modifications induced by irradiation reflect in a greater capacity of water absorption.
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Article dans une revue avec comité de lectureGALANT, C; FAYOLLE, Bruno; KUNTZ, M.; VERDU, Jacques (Elsevier, 2010)Degradation induced by thermal (50-110 °C) and radio-oxidation of low T g epoxy-amine networks has been studied. It has been found that oxidation leads mainly to amide groups formation at the vicinity of tertiary amines ...
Article dans une revue avec comité de lectureDJOUANI, Fatma; ZAHRA, Yahya; FAYOLLE, Bruno; KUNTZ, M; VERDU, Jacques (Elsevier, 2014)Epoxy networks based on Diglycidyl ether of bisphenol A (DGEBA) and cured with Jeffamines (POPA) or polyamidoamine (PAA) were gamma irradiated at 25 1C in air. Dose rates of 50, 200 or 2000 Gy h- 1 for doses up 100 kGy ...
Article dans une revue avec comité de lectureZAHRA, Yahya; DJOUANI, Fatma; FAYOLLE, Bruno; KUNTZ, M; VERDU, Jacques (Elsevier, 2014)tThe thermo-oxidative behavior of unformulated (unfilled) samples of epoxy coatings has been studiedat five temperatures ranging from 70◦C to 150◦C. Two epoxy networks based on diglycidyl ether ofbisphenol A (DGEBA), ...
New insights in polymer-biofuels interaction Avancées dans la compréhension des interactions polymères-biocarburants Article dans une revue avec comité de lectureRICHAUD, Emmanuel; DJOUANI, Fatma; FAYOLLE, Bruno; VERDU, Jacques; FLACONNECHE, Bruno (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 lectureLE GAC, Pierre Yves; ROUX, Gérard; VERDU, Jacques; DAVIES, Peter; FAYOLLE, Bruno (Elsevier, 2014)Thermal oxidation in air at atmospheric pressure, in the 80-140 °C temperature range and in oxygen at 100 °C in the 0.02-3 MPa pressure range, of unvulcanized, unstabilized, unfilled polychloroprene (CR) has been characterized ...