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Synthèse par polymérisation en émulsion d’objets hybrides dans le système silice/latex : Application à la granulation par voie colloïdale de l’alumine

Abstract : This work is centered on the silica/latex hybrid particles synthesis: the aim of the study is to partially cover the polystyrene beads with silica nanoparticles. For this purpose, in-situ emulsion polymerization of the organic phase with silica has been selected with organic auxiliaries to make the surfaces amphiphilic. The first compositions processed with surfactants did not lead to latex decoration because the presence of the molecules at the interface favors the dispersion of the latex impeding silica adsorption. Then, the study of two systems with, in one hand negatively charged silica and PEGMA, and in the other hand positively charged silica and PSS, allowed to get “decorated” latex characterized by TGA and TEM. The proposed mechanisms are based on the homogeneous nucleation or the droplet nucleation mechanisms depending on the conditions. It appears that the control of the interactions that could be produced at the surface of the latex is very important to allow the silica to go at the surface. Thus, the initiator or organic auxiliary choice is a key parameter to get hybrid particles.In the last part of this study, silica has been introduced via hybrid particles in an alumina suspension to proceed to heterocoagulation of both materials leading to alumina granulation. The combination of the properties of the organic and inorganic material that constitute the hybrid particles leads to the improvement of the microstructural organization inside the spheres during the drying step by reducing significantly the cracks in the spheres.
Keywords : Hybrid particles
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Quitterie Monegier Du Sorbier. Synthèse par polymérisation en émulsion d’objets hybrides dans le système silice/latex : Application à la granulation par voie colloïdale de l’alumine. Matériaux. Université de Limoges, 2016. Français. ⟨NNT : 2016LIMO0023⟩. ⟨tel-01336168⟩

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