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Theses

Développement de nouveaux systèmes retardateurs de flammes à base de nanocomposites plus respectueux de l'environnement

Abstract : Following the restrictions made by the United Nations and the European Community on certain halogenated flame-retardants, the current market demand tends to move towards non-halogenated compounds such as phosphorous flame-retardants. However, it is necessary to use high amounts of material for reaching interesting fire resistance properties, resulting in a drop of mechanical properties. This led us to combine a part of the phosphorous compounds with nanoscale metal oxides, known for their ability to improve the stability of poly (methyl methacrylate) (PMMA).We have first studied the effect of nanoparticles (titanium dioxide, alumina and boehmite) on the thermal diffusivity of PMMA, in order to highlight a mode of action of these additives during the thermal degradation of PMMA. A part of these metal oxides have then been substituted by two flame-retardants based on phosphorus and nitrogen: ammonium polyphosphate (APP) and melamine polyphosphate (MPP). In the obtained ternary systems (APP/MPP/metal oxide), the properties of fire resistance and thermal stability were studied and also the mechanisms involved in the degradation. Gaseous and condensed phases have been analyzed for this purpose
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  • HAL Id : tel-01749034, version 1

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Blandine Friederich. Développement de nouveaux systèmes retardateurs de flammes à base de nanocomposites plus respectueux de l'environnement. Autre. Université Paul Verlaine - Metz, 2011. Français. ⟨NNT : 2011METZ012S⟩. ⟨tel-01749034⟩

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