Étude du comportement à long terme d'accessoires en polyamide 66 utilisés dans les réseaux d'eau intérieurs

Abstract : Nowadays, chlorine dioxide is an alternative of chlorine for the disinfection of drinking water. Although its biocide ability is well known, scientific literature lacks of knowledge about its effects on organic materials in domestic water networks. The use of PA 66 for valves is quite recent: its long term behaviour is thus unknown. The aim of this study was to improve the knowledge of the interaction mechanisms between chlorine dioxide and a PA 66 matrix stabilized by blend of two antioxidants and reinforced by glass fibres, but also to propose a multi-scale method for the lifetime prediction of this composite material in service. First of all, a better description of the chemical reactions occurring within the material (oxidation, hydrolysis, polymer protection by antioxidants, chemical attack of polymer and antioxidants by disinfectant) has allowed elaborating a general degradation mechanistic scheme. Kinetic equations were derived from this mechanistic scheme for predicting the chemical changes, considering a heterogeneous distribution of antioxidants within the PA 66 matrix and taking into account most exposure conditions (water temperature, concentration in chemical reactants, time). Then, the aged material was tested in use conditions thanks to hydrostatic pressure experiments in order to identify its failure regime.
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Julie Dausseins. Étude du comportement à long terme d'accessoires en polyamide 66 utilisés dans les réseaux d'eau intérieurs. Mécanique des matériaux [physics.class-ph]. Ecole nationale supérieure d'arts et métiers - ENSAM, 2015. Français. ⟨NNT : 2015ENAM0017⟩. ⟨tel-01195652⟩

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