Dresden 2009 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 1: Focus: Amphiphilic Systems I
CPP 1.4: Vortrag
Montag, 23. März 2009, 11:45–12:00, ZEU 222
Adsorption and Near-Interface Structure of Tri-block Copolymer Micelles — •Nicole Voss1, Marco Walz1, Stefan Gerth1, Philipp Gutfreund2, Max Wolff2, Hartmut Zabel2, and Andreas Magerl1 — 1Chair for Crystallography and Structural Physics, University of Erlangen-Nürnberg, Staudtstr. 3, 91058 Erlangen, Germany — 2Chair for Solid State Physics/EP IV, Ruhr-University Bochum, Universitätsstr. 150, 44780 Bochum, Germany
Micellar solutions of block copolymers have rich phase diagrams and they are an excellent model system for the study of crystallization in soft matter. Further, the surface active properties of these systems lead to a distinct sensitivity of micellar structures on the wettability of a solid boundary.
In our studies we investigated the tri-block copolymer EO(20)-PO(70)-EO(20) solved in water using in-situ rheometry, Grazing Incidence Small Angle Neutron Scattering (GISANS) and neutron reflectometry to extract the structural arrangements close to a solid interface in concentrated and dilute solutions. We report on the dependence of structural properties and interfacial adsorption of micelles on surface energy and temperature. After the cessation of applied shear we find a relaxation of the crystalline stucture which is determined by the type of micellar structure as well as by the chemical potential of the adjacent surface.