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Effect of confined polymer on the properties of lyotropic lamellar mesophases

Abstract : This thesis deals with the effect of the incorporation of the adsorbing polymer polyethylene glycole (PEG) on the structural and elastic properties of lyotropic lamellar mesophases. In particular, these polymer doped-lamellar phases are of great interest for understanding the intermembrane interactions mediated by the macromolecule. Firstly, the bending elastic modulus of the membranes has been investigated along several dilution lines of polymer. It was obtained from the measurements of quadrupolar splittings by deuterium solid state Nuclear Magnetic Resonance (NMR) spectroscopy of the perdeuterated cosurfactant molecule embedded in the membrane. In the presence of the adsorbed polymer the value of the bending elastic modulus was found to increase of about 20% as soon as the polymer solution becomes semi-diluted. Secondly, the diffusion coefficient of the polymer in water and confined in the lamellar phase is discussed. The structure of the mesophases was investigated by small angle X-ray scattering and freeze-fracture electon microscopy. Finally, the direct measurements of the compressibility modulus of the lamellar mesophases were also carried out.
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Viktoriia Meklesh. Effect of confined polymer on the properties of lyotropic lamellar mesophases. Physics [physics]. Université de Strasbourg; Kií̈vsʹkij nacíonalʹnij uníversitet ím. Tarasa Ševčenka. Centr Ukraïnoznavstva (Ukraine), 2017. English. ⟨NNT : 2017STRAE024⟩. ⟨tel-01729019⟩

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