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Durabilité des élastomères thermoplastiques pour applications marines

Abstract : Thermoset elastomers are currently used for watertightness applications on marine structures, due to their interesting elastic properties and their important chemical resistance. However, thermoplastic elastomers (TPEs) represent an interesting alternative in an industrial context being increasingly restrictive toward chemical risks. In order to determine their behaviour in marine environment, hydrolytic and oxidative ageing of several TPEs was investigated. Degradation was particularly assessed with molecular chain scission measurement. Based on these data, a hydrolytic kinetic model predicting scissions was developed, including the autocatalytic effect as well as the use of a hydrolytic stabilizer. Meanwhile, characterization of mechanical properties change enabled to highlight strong correlation between molar mass and failure properties, including all TPEs and all exposure conditions. Finally, in situ XRD analyses showed that the failure properties loss is associated with a weakening of the strain-induced crystallization phenomenon. Coupling the hydrolytic kinetic model and the relationships between chain scissions and mechanical behaviour, a prediction of the mechanical failure properties change for all exposure conditions was proposed.
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Submitted on : Thursday, September 24, 2020 - 2:32:10 PM
Last modification on : Saturday, September 26, 2020 - 3:11:50 AM

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  • HAL Id : tel-02948183, version 1

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Antoine Bardin. Durabilité des élastomères thermoplastiques pour applications marines. Autre [cond-mat.other]. HESAM Université, 2020. Français. ⟨NNT : 2020HESAE004⟩. ⟨tel-02948183⟩

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