Regensburg 2007 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Polymer Physics III: Interfaces
CPP 12.4: Talk
Tuesday, March 27, 2007, 11:00–11:15, H40
Amphiphilic Block Copolymers at the Liquid-Fluid Interface: Dynamics in Different Regimes — •Antonio Stocco1, Stergios Pispas2, and Reinhard Sigel1 — 1MPI of Colloids and Interfaces, D-14476 Golm — 2Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, Athens, Greece
Structure and dynamics of a block copolymer at the water-air (WA) and the water-dodecan (WD) interface are investigated. Because of its amphiphilic property, polyisoprene-block-polyethyleneoxide (PI-PEO) is attracted to such interfaces. By changes of the interface concentration, the overlap and the stretching of the blocks is varied from the mushroom to the brush regime. The extent of the interfacial polymer layer is followed by reflection ellipsometry. Complementary information is obtained from static and dynamic evanescent wave light scattering. For both types of interface, a 2D diffusion process is found which slows down with increasing interface concentration. The significantly slower diffusion at the WD interface compared to the WA interface is discussed.