Interactions entre trisiloxanes fonctionnalisés et surfaces minérales : applications à l'hydrofugation

Abstract : Surface modification of mineral substances with adsorbed organic layers can be used to prevent the weathering of facades. To enhance interactions between the silicone formulations and surfaces, anchorage functions can be inserted in the polydimethylsiloxane (PDMS) network. This study deals with the abstraction of functionalized PDMS fragments (trisiloxane compounds), from cyc1ohexane, onto minerals typical of most surface materials used for building facades: a silica, a carbonate, a pyrophyllite and cement hydrates. The anchorage functions studied are derived from piperidine (secondary and ternary amine) or succinic acid (anhydride and diacid). The adsorption of piperidinic compounds is strongly dependent on hydrogen bonds formed between the superficial hydroxyl groups and the amine groups. In the case of succinic compounds, adsorption takes place mainly through carboxylate functions. Focussing on the various spectroscopic signatures of stretching vibrations of the carbonyl bonds of the carboxylic functions (anhydride, diacid, dissociated diacid), phenomena in both the liquid phase and on the solid surfaces can be approached precisely. The last part of this thesis examines the evolution of the superficial properties of calcium carbonate powders coated with increasing amounts of anhydride molecules. Using high resolution nitrogen and argon adsorption, it is possible to visualize the progressive coverage of the surface by water repellent molecules. Water adsorption isotherms reveal that the hydrophobicity of solids does not prevent the adsorption of water molecules but that the structure of adsorbed water layers is strongly perturbated when compared to liquid water or to water adsorbed on the untreated mineral surface.
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Manuel Chamerois. Interactions entre trisiloxanes fonctionnalisés et surfaces minérales : applications à l'hydrofugation. Sciences de la Terre. Institut National Polytechnique de Lorraine, 2000. Français. ⟨NNT : 2000INPL009N⟩. ⟨tel-01750391⟩

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