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Vieillissement en milieu eau/glycol du polyamide 66 renforce fibres de verre courtes pour l'application boite a eau de radiateur de refroidissement moteur

Abstract : In the real conditions in use at 130°C, the water end tank can degrade when exposed to anti-frozen liquid (mixture of water and glycol). The purpose of this thesis is to describe the aging mechanism of the composite, composing the water end tank, exposed to anti-frozen liquid. The approach consisted in studying the PA66 polymer and the composite (PA66GF30) at several temperatures in contact with water, glycol and frozen liquid medium separately. In all cases, the evolution of the properties in use, and particularly the mechanical properties have been linked to the evolution of the chemical structure at the macromolecular scale. Therefore, the molar mass evolution, followed by steric exclusion chromatography, has been pertinent and determinant for the comprehension of aging mechanisms. Thus, in water medium and as expected, it's the equilibrated hydrolysis reaction, by statistic chains scissions, which leads to the embrittlement of the material. At the glycol exposure, there isn't glycolysis at the temperature considered, only the absorbed solvent leads to the irreversible degradation by chains disentanglement. In anti-frozen liquid medium, the combined action of the physical aging of glycol by chains disentanglement and of water chemical aging by hydrolysis leads to the material collapse. Its lifetime in frozen liquid is shorter than in pure water medium.
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Contributor : Bastien Ledieu <>
Submitted on : Wednesday, December 15, 2010 - 4:01:23 PM
Last modification on : Friday, July 17, 2020 - 2:54:12 PM
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  • HAL Id : pastel-00547111, version 1

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Bastien Ledieu. Vieillissement en milieu eau/glycol du polyamide 66 renforce fibres de verre courtes pour l'application boite a eau de radiateur de refroidissement moteur. Polymères. Arts et Métiers ParisTech, 2010. Français. ⟨NNT : 2010ENAM0050⟩. ⟨pastel-00547111⟩

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