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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 10: Poster: Structure and Dynamics of Responsive Hydrogels

CPP 10.8: Poster

Monday, March 22, 2010, 16:30–18:00, Poster C

Characterization of PMDEGA based hydrogel films — •Qi Zhong¹, Gunar Kaune¹, Monika Rawolle¹, Ezzeldin Metwalli¹, Achille M. Bivigou-Koumba², Andre Laschewsky², Christine M. Papadakis¹, Robert Cubitt³, and Peter Müller-Buschbaum¹ — ¹Technische Universität München, Physik Department E13, James-Franck-Str.1, 85747 Garching, Germany — ²Potsdam Universität, Inst. Chemie, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany — ³Institut Laue-Langevin, 6 rue Jules Horowitz, 38000 Grenoble, France

Stimuli-sensitive hydrogels exhibit interesting properties which attract increasing attention due to a large variety of applications such as drug delivery, sensors and bioseparation. A novel thermo-responsive poly(monomethoxy diethyleneglycol acrylate) (PMDEGA) exhibits a higher lower critical solution temperature (LCST) when compared to the frequently investigated thermoresponsive polymer poly(N-isopropylacrylamide) (PNIPAM). Thus PMDEGA can be an interesting alternative to PNIPAM in tropical countries where the temperature is above the LCST of PNIPAM. In order to create an internal ordering in the thin hydrogel films of PMDEGA, the homopolymer is replaced by a PMDEGA based tri-block copolymer with polystyrene as an end group, P(S-b-MDEGA-b-S). Thin films of homo- and tri-block polymer with different thickness are prepared by spin coating and characterized with X-ray reflectivity and white light interferometry. Neutron reflectivity is used to investigate the kinetic behaviour of the films in temperature jumps above LCST.