Regensburg 2010 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 13: Poster: Crystallization and Self Assembly
CPP 13.1: Poster
Monday, March 22, 2010, 16:30–18:00, Poster C
Block copolymer micelles at the solid-liquid interface — •Nicole Voss1, Marco Walz1, Stefan Gerth1, Philipp Gutfreund2, Max Wolff3, Hartmut Zabel2, and Andreas Magerl1 — 1Crystallography and Structural Physics, University of Erlangen, Germany — 2Solid State Physics/EP IV, Ruhr-University Bochum, Germany — 3Division for Materials Physics, Department of Physics and Material Science, Uppsala University, Sweden
Micellar solutions of block copolymers have rich phase diagrams, which can be controlled by temperature or polymer concentration. Due to the correlation between strucutural properties and macroscopic viscosity the phases can be located using rheometry. A salient result of our investigations is that block copolymer micelles may strongly remember their thermal history. In this regard, a different phase behavior depending on whether heating or cooling the sample can be observed.
Further, these amphiphilic systems are highly sensitive to the properties of a solid boundary. We investigated the solid-liquid interface between aqueous solutions of the copolymer EO(20)-PO(70)-EO(20) and solid walls with different chemical treatments. Using neutron reflectometry we depict the influence of surface energy and temperature on the adsorption behavior of single micelles at solid interfaces. To extract the structural arrangements in concentrated solutions we performed Grazing Incidence Small Angle Neutron Scattering (GISANS) and found a distinct dependance of the near-surface micellar ordering on the surface energy.