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Structure et déformation des films de Langmuir. Application aux copolymères diblocs neutres-chargés

Abstract : This study deals with the properties of poly(tert-butylstyrene)/poly(styrene sulfonate) diblock copolymer monolayers spread at the air/water interface. In the explored range of molecular areas, surface pressure isotherms show the theoreticaly expected osmotic brush regime of tethered polyelectrolytes. Some defects, due to high pressure relaxation processes and spreading solvent remaining in the monolayer have also been outlined. Using Brewster angle microscopy, some structures (from 5 to 35 micrometer size) appear during the compression of the monolayer. Diffuse X-ray scattering experiments reveal a small amplitude (on the nanometer scale) buckling of the interface. The buckling instability is induced by an exchange of molecules between the interface and the bulk. The size of the structures depends on the layer thickness and seems to be insensitive to the salinity of the sub-phase. All these properties can be qualitatively taken into account in several mechanisms we suggest. In order to get direct informations on the structures formed at the interface, we developed a new observation method based on atomic force microscopy on liquid interface. The promising results we get on different systems at the air/water interface open a wide range of applications for this new technique.
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Submitted on : Monday, April 15, 2002 - 11:41:27 AM
Last modification on : Friday, March 5, 2021 - 3:12:06 PM
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  • HAL Id : tel-00001306, version 1

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Frédéric Dubreuil. Structure et déformation des films de Langmuir. Application aux copolymères diblocs neutres-chargés. Analyse de données, Statistiques et Probabilités [physics.data-an]. Université Pierre et Marie Curie - Paris VI, 2001. Français. ⟨tel-00001306⟩

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