Mise au point d'un nanorhéomètre : Application à l'étude du confinement de polymères adsorbés ou greffés sur une surface inorganique

Abstract : Conformation and dynamic of macromolecules in contact with a surface are fundamental to understand macroscopic behaviour. Theoric models are proposed to explain this conformation and static and dynamic forces but their validation needs specialised instrumental apparatus. To characterise dynamic behaviour of this interface, The laboratory used a commercial nanoindenter to transform it as a surface force apparatus which allows the mechanical spectrometry of a confined fluid. This nanorheometer can then characterise adhesion or hydrodynamic forces. The development of the technic was done studying behaviour of three adsorbed melted polymer and two grafted surfacest of poly-n-butylacrylate synthesised at the laboratory. These characterisations are the beginning of grafted polymer study. Some resuts about the dynamics of a viscoelastic fluid were shown: change in the molecular mobility, elastic increased with the interpenetration of the macromolecules in contact with the surface, and slippage of the macromolecule at the interface because of the increased of the applied stress. Comparisons with older experimental or theoric studies will be done.
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Bertrand Guatarbes. Mise au point d'un nanorhéomètre : Application à l'étude du confinement de polymères adsorbés ou greffés sur une surface inorganique. Matière Molle [cond-mat.soft]. Université de Pau et des Pays de l'Adour, 2006. Français. ⟨NNT : 2006PAU3046⟩. ⟨tel-01324412⟩

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