Dresden 2006 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 11: POSTER Disperse Polymer Systems

CPP 11.15: Poster

Dienstag, 28. März 2006, 17:00–19:00, P3

Multicompartment micellar gels of amphiphilic poly(2-oxazoline) triblock copolymers — •C.M. Papadakis¹, R. Ivanova¹, T. Bonné¹, K. Pranzas², K. Mortensen³, K. Lüdtke⁴, T. Komenda⁴, and R. Jordan⁴ — ¹Physikdepartment E13, Technische Universität München, James-Franck-Str. 1, D-85747 Garching — ²Institut für Werkstoffforschung, GKSS, Geesthacht — ³Danish Polymer Centre, Risø National Laboratory, Roskilde, Denmark — ⁴Lehrstuhl für Makromolekulare Stoffe, Chemiedepartment, Technische Universität München, 85 747 Garching

Amphiphilic triblock copolymers are widely used as gel formers, e.g. in cosmetics. Poly(2-oxazoline) block copolymers constitute a new and versatile system and are promising candidates for the formation of micellar gels with chemically different types of micelles. This may be achieved by using triblock copolymers with blocks containing lipophilic, hydrophilic and fluorophilic side groups. Using small-angle neutron scattering with contrast matching, we could show that diblock copolymers with lipophilic and fluorophilic blocks and the same hydrophilic block do not form common micelles in aqueous solution. The cores of the micelles formed by copolymers with lipophilic blocks are spherical, whereas the ones from fluorophilic blocks are short cylinders, which is possibly due to the steric demands of the fluorophilic side chains forcing the polymer backbone to stretch. Triblock copolymers form gels above 10 wt-%. Their scattering can be described by a coexistence of spherical, lipophilic and elliptical, fluorophilic micellar cores, which are linked by the hydrophilic blocks. Thus, the system forms a multicompartment gel.