Etude de la diffusion de l’eau dans une jonction HTA

Abstract : Ethylene Propylene Diene Monomer (EPDM) based elastomers are used in the accessories of the underground electrical distribution network for guaranteeing the insulation of cable junctions. Indeed, the chemical structure of this apolar polymer gives the desired hydrophobicity for this application. However, in service conditions, thermo-oxidation causes an incorporation of oxygen atoms (formation of hydrophilic function) into EPDM chains. Thus, this PhD thesis aimed at studying the influence of thermal oxidative ageing on the water transport properties into EPDM accessories. Three unfilled formulations (one peroxide crosslinked and two sulfur vulcanized) and six industrial formulations (all vulcanized) were submitted to an accelerated thermal ageing in air-ventilated ovens between 90 and 190 °C. The multi-scale analysis (combining several experimental techniques) allowed highlighting the structural changes in EPDM matrices and establishing correlations between the physico-chemical properties measured during ageing. Then, the water transport properties were characterized between 30 and 70 °C and between 10 and 100 %RH at the initial state and for different oxidation states. These results allowed establishing structure/property relationships between water transport properties and oxygen incorporation, but also to simulate the crucial influence of fillers.
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Maxime Lacuve. Etude de la diffusion de l’eau dans une jonction HTA. Mécanique des matériaux [physics.class-ph]. Ecole nationale supérieure d'arts et métiers - ENSAM, 2019. Français. ⟨NNT : 2019ENAM0008⟩. ⟨tel-02148340⟩

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