Berlin 2008 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 21: POSTERS Colloids, Nanoparticles and Aggregates
CPP 21.7: Poster
Wednesday, February 27, 2008, 16:00–18:30, Poster A
Self-assembly and multi-compartment micellar hydrogel formation of amphiphilic di- and triblock copolymers containing fluorophilic blocks — •Ruzha Ivanova1, Tune Bonné1, Kell Mortensen2, Klaus Pranzas3, Thomas Komenda4, Karin Lüdtke4, Rainer Jordan4, and Christine Papadakis1 — 1Physikdepartment E13, TU München, 85747 Garching — 2Risø National Laboratory, Roskilde, Denmark — 3GKSS, Geesthacht — 4Department Chemie, TU München, 85747 Garching
The self-assembly of novel amphiphilic poly(2-oxazoline) di- and triblock copolymers containing hydrophilic and fluorophilic and/or lipophilic blocks in aqueous solutions was studied. Small-angle neutron scattering together with contrast matching was used to study the size and the shape of the micelles as well as the effect of the copolymer concentration and the length of the hydrophilic block on the structure. In addition, transmission electron microscopy was used to visualize the micelles. The diblock copolymers aggregate into core-shell micelles. The micelles formed by the lipophilic-hydrophilc copolymers are spherical, whereas those formed by the hydrophilic-fluorophilic copolymers are slightly elongated. The triblock copolymers aggregate into micelles, and at higher concentrations, hydrogels are formed. We could show that the scattering curves of the hydrogels can be described by a coexistence of spherical lipophilic and elongated fluorophilic micellar cores linked by the hydrophilic blocks. Thus the studied poly(2-oxazoline) copolymers have large practical potential as multi-compartment vehicle systems in e.g. medicine or cosmetics.