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Elaboration de mousses solides par émulsions hautement concentrées. Etude de la relation liant le comportement mécanique avec la structure mésoscopique et la nature physico-chimique

Abstract : Foams are everywhere in the society thanks to their remarkable properties resulting from the coupling of their structure and their physico-chemical nature which are very adaptable. The main goal of this thesis is the study of the relationship between mechanical properties of elastomeric foams and their mesoscopic structure (open or closed-porosity and cells diameter) and their physico chemical nature of elastomeric matrix. In this context, it was necessary to synthesize model porous materials with well-controlled densities and structure. HIPE (High Internal Phase Emulsion) template technique was used thanks to its ability modifying matrix chemical composition and structure. Control of emulsion’s parameters (internal phase ratio, monomers and crosslinker nature, surfactant and crosslinker content) enables tuning foam morphology. Moreover it enables to vary one parameter without changing others. Thanks to this method we were able to synthesize elastomeric foams with well-controlled structure and physico-chemical nature matrix. In the real special case of very low crosslinker content, foam collapsing effect has been detected. Foams are mechanically characterized in compression test depending on tree parameters: glass transition temperature of the polymer matrix, crosslinked ratio and cells diameter of the foam. Elastic modulus and dissipated energy are studied to inverstigate more deeply the relationship with physico-chemical nature and mesoscopic structure. Time behavior response of foams leads us to study recovery ratio of foams and we try to determine a theoretical model.
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Submitted on : Sunday, April 15, 2018 - 1:02:03 AM
Last modification on : Sunday, October 25, 2020 - 7:42:44 PM

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  • HAL Id : tel-01767011, version 1

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Charles Barrand. Elaboration de mousses solides par émulsions hautement concentrées. Etude de la relation liant le comportement mécanique avec la structure mésoscopique et la nature physico-chimique. Chimie-Physique [physics.chem-ph]. Université Pierre et Marie Curie - Paris VI, 2017. Français. ⟨NNT : 2017PA066388⟩. ⟨tel-01767011⟩

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