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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 27: Poster: (Hydrogels) and Elastomers

CPP 27.11: Poster

Mittwoch, 28. März 2012, 11:00–13:00, Poster A

Swelling and switching behavior of thermo-responsive P(S-b-MDEGA-b-S) hydrogel films under vapor atmosphere — •Qi Zhong¹, Ezzeldin Metwalli¹, Monika Rawolle¹, Gunar Kaune¹, Achille M. Bivigou-Koumba², Andre Laschewsky², Christine M. Papadakis¹, Robert Cubitt³, and Peter Müller-Buschbaum¹ — ¹TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching, Germany — ²Potsdam Universität, Inst. Chemie, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany — ³ILL, 6 rue Jules Horowitz, 38000 Grenoble, France

By a change of temperature below or above the lower critical solution temperature (LCST), thermo-responsive hydrogels switch between a swollen and a collapsed state. The thermo-responsive poly(monomethoxy diethyleneglycol acrylate) (PMDEGA) exhibits a higher LCST (39.6 oC) as compared to the frequently investigated poly(N-isopropylacrylamide) (PNIPAM), which can be advantageous for many applications. To introduce an internal ordering, a tri-block copolymer with hydrophobic polystyrene end-blocks is under investigation. P(S-b-MDEGA-b-S) films are successfully prepared by spin-coating. The response of P(S-b-MDEGA-b-S) films to a sudden thermal stimulus is probed. To study this switching behaviour, in-situ neutron reflectivity is used. P(S-b-MDEGA-b-S) films subjected to different thermal stimuli are under investigation.