Dresden 2006 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 11: POSTER Disperse Polymer Systems
CPP 11.40: Poster
Dienstag, 28. März 2006, 17:00–19:00, P3
Diffusion of Block-Copolymer Micelles Close to the Water-Oil Interface — •Antonio Stocco1, Stergios Pispas2 und Reinhard Sigel1 — 1Max-Planck-Institut of Colloids and Interfaces, D-14476 Golm — 2National Hellenic Research Foundation, Theoretcal and Physical Chemistry Institute, 11635 Athens, Greece
The interaction of block copolymer micelles in water with a brush composed of the same block copolymer at the water-oil interface is investigated. For a concentration above the critical micelle concentration, the block copolymers adsorbed to interfaces coexists with block copolymer micelles in solution. Close to the interface, a modification of the micelle diffusion compared to the bulk behavior is expected because of changed friction and possible exchange processes. We built up an apparatus for light scattering with evanescent wave illumination of a liquid-liquid interface. In this special geometry, only a thin layer at the interface is illuminated, allowing for dynamic light scattering measurements close to the interface. In addition, ellipsometry measurements within the same apparatus give access to the interface profile. First results on polyisoprene-block-polyethyleneoxide polymers at to the water-dodecane interface are discussed.