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Glissement de polymères liquides

Abstract : The goal of this work was to identify the molecular mechanisms governing the friction of a polymeric liquid on a solid surface by studying the deviation from the no-slip boundary condition.First, we developed a new method of measurement of slip of a polymeric liquid based on the observation under shear of a pattern photobleached in a fluorescent fluid. This method, which is an evolution of one already used in the group, give a direct access to the displacement field of the liquid under shear. Using this setup, we studied experimentally the effect of the chemical nature of the surface, of the liquid viscosity and of the temperature on the slip of polymer melt (T>Tg). It appeared that the slip effect is governed by the viscosity of the liquid and a friction coefficient which depends only on the chemical natures of the liquid and the surface. In particular this coefficient is the same for a melt and for an elastomer made of the same polymer. The temperature dependence of this effect is characterized by the difference of activation energy of viscosity of the liquid and of the friction on the solid surface that both are activated processes. We also studied the case of concentrated polymer solutions for which the molecular mechanism of friction differs. Indeed we showed that the friction coefficient is no longer a local quantity and depends on the concentration. Finally, we investigated the evolution over time of the slip transition of polymer melts and solutions which is due to the adsorption of polymer chains on the solid walls.
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Submitted on : Thursday, August 30, 2018 - 3:21:10 PM
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  • HAL Id : tel-01864854, version 1

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Marceau Hénot Hénot. Glissement de polymères liquides. Matière Molle [cond-mat.soft]. Université Paris Saclay (COmUE), 2018. Français. ⟨NNT : 2018SACLS194⟩. ⟨tel-01864854⟩

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