Berlin 2008 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 25: Polyelectrolytes
CPP 25.2: Vortrag
Mittwoch, 27. Februar 2008, 14:45–15:00, C 230
Conformational changes in polyelectrolyte polymer brushes - A strategy for locally controlled surface properties — •Rosa Poetes1, Ullrich Steiner1, Tim Kelby2, Ron Oren2, Feng Zhou2, and Wilhelm Huck2 — 1Cavendish Laboratory, University of Cambridge, Cambridge, UK — 2Melville Laboratory, University of Cambridge, Cambridge, UK
Stimuli-responsive polymer brushes are promising systems for local triggering of surface properties. Conformational states of polymer brushes in the liquid environment can be monitored using spectroscopic ellipsometry. We hope to achieve local switching of surface properties using stimuli-responsive polyelectrolyte polymer brushes. Binary polymer brushes with responsive and non-responsive components are particularly adapted for such applications.
Temperature induced conformational changes of Poly[N-isopropylacrylamide] (PNIPAM) in water were observed and characterised to show the applicability of the technique. Studies of patterned binary brush systems containing PNIPAM and Poly[oligo(ethylene glycol) methacrylate] (POEGMA) demonstrated the possibility of following localised conformational changes using imaging ellipsometry.
Conformational changes in polyelectrolyte polymer brushes are being studied in response to electric fields. Current work is focusing on the characterisation of polyelectrolyte polymer brushes in the liquid environment. The effects of electric fields on poly[2-(methacryloyloxy)ethyl trimethylammonium chloride] (PMETAC) in water are currently being investigated.