Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 14: Elastomers and Gels
CPP 14.3: Vortrag
Dienstag, 15. März 2011, 11:15–11:30, ZEU 114
Switching kinetics of pMDEGA based thermo-responsive hydrogel films probed by in-situ neutron reflectivity — •Qi Zhong1, Gunar Kaune1, Monika Rawolle1, Ezzeldin Metwalli1, Achille M. Bivigou-Koumba2, Andre Laschewsky2, Christine M. Papadakis1, Robert Cubitt3, and Peter Müller-Buschbaum1 — 1TU München, Physik Department, LS Funkt. Mat., James-Franck-Str. 1, 85748 Garching, Germany — 2Universität Potsdam, 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. In order to create an internal ordering in thin PMDEGA hydrogel films, the homopolymer is replaced by a PMDEGA based tri-block copolymer with polystyrene as an end group, P(S-b-MDEGA-b-S). Homo- and tri-block polymer thin films, with thickness of 35.9 nm and 39.4 nm respectively, are prepared by spin coating. Neutron reflectivity is used to probe the kinetic behaviour of the thermo-responsive hydrogel films in temperature jumps above the LCST.