Adsorbed Polymers under highly viscous flow
In this study, we plan to understand the molecular mechanism underlying in the flow of semi-dilute polymer solutions near a solid interface. Thanks to velocimetry techniques based on photobleaching, we measured the slippage of semi dilute polymer solutions as a function of the volume fraction. The scaling law resulting from this measurements is consistent with two mechanisms: either there is a depletion layer, inducing inhomogeneities of concentrations close to the substrate; or polymer solutions are slipping with the same mechanism as melts at the scale of the bulk polymer correlation length. Neutron reflectivity measurements at rest have shown that polymer chains adsorb onto the substrate which play a major role in the stress transmission mechanism. Here we plan to study the influence of the shear of the polymer solution on the conformation of the surface chains. Such in-situ experiment combined with our slippage measurements should highlight the overall behaviour of polymer solutions flowing onto weakly adsorbing surfaces.
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CHENNEVIERE Alexis; DUDZINSKI Daniel; GUTFREUND Philipp; LAFON Suzanne; OUTERELO CORVO Tiago and Restagno. (2021). Adsorbed Polymers under highly viscous flow. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-2020
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