Regensburg 2007 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 11: INTERNAL SYMPOSIUM Scattering Experiments II
CPP 11.9: Talk
Tuesday, March 27, 2007, 16:45–17:00, H37
Micellar hydrogels of poly(2-oxazoline) copolymers containing fluorophilic, hydrophilic and lipophilic blocks — •Ruzha Ivanova1, Tune Bonné1, Kell Mortensen2, Philipp Pranzas3, Thomas Komenda4, Karin Lüdtke4, Rainer Jordan4, and Christine Papadakis1 — 1Physikdepartment E13, TU München, 85 747 Garching — 2Risø National Laboratory, Roskilde, Denmark — 3GKSS, Geesthacht — 4Department Chemie, TU München, 85 747 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. It was shown that lipophilic-hydrophilic and hydrophilic-fluorophilic diblock copolymers do not form common micelles. This result is an important prerequisite for the formation of multi-compartment micelles and hydrogels in aqueous poly(2-oxazoline) systems. 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.