Dresden 2009 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 11: POSTERS Amphiphilic Systems

CPP 11.1: Poster

Tuesday, March 24, 2009, 14:00–16:30, P3

Micellization of PAO-PEO Diblock Copolymers — Michael Ströbl, •Gerald Johannes Schneider, Jörg Stellbrink, Jürgen Allgaier, and Dieter Richter — Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich

If amphiphilic diblock copolymers are dissolved in aqueous solutions micelles may be formed. The dependency of the shape from the interfacial tension between micelle and solvent has not been understood to any great extent and thus the investigation is of great importance for basic research. Existing applications further enhance the interest. For example active pharmaceutical ingredients which can be imbedded within the micelles and then selectively released at a particular place in a human body open a broad field of applications.

In order to investigate the dependency of the shape from the surface tension poly(alkyleneoxide)-poly(ethyleneoxide)-blockcopolymers, which were only recently synthesized [1], are very suitable. In aqueous solutions these samples form micelles whereas the geometry depends on the surface tension, and therefore on the length of the hydrophobic alkylenoxide-block. In our contribution findings of SANS experiments are presented. The results of the surface tension measurements are compared to existing theories.

[1] J. Allgaier, S. Willbold , T. H. Chang, Macromolecules, 40, 518-525, 2007.