Regensburg 2013 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 33: Poster: Charged Soft Matter
CPP 33.11: Poster
Mittwoch, 13. März 2013, 16:30–18:30, Poster C
Quaternized Brushes of Weak Polyelectrolytes (PE): Brush Structure Studied with Neutron Reflectometry — •Zuleyha Yenice1, Jan Genzer2, Regine v.Klitzing1, and Ralf Köhler1,3 — 1Stranski Lab, Inst. of Chemistry, TU Berlin, Germany — 2Dept. of Chemical & Biomolecular Engineering, NCSU, Raleigh, USA — 3Inst. of Soft Matter and Functional Materials, HZB Berlin, Germany
PE-brushes are used for surface modifications because of properties as specific adsorption, permeability and stimuli responsive behavior. PDMAEMA* is a weak PE with pH-dependent properties, giving room for further modifications like protonizing by varying the pH, or turning them into strong PE by quaternization. The PDMAEMA-brush was gradually quaternized with deuterated iodomethane. Deuterium simultaneously labels the brush for neutron reflectometry (NR) without altering its chemistry. NR was applied to detect the inner structure, density, and thickness after partially quaternizing the brush, to see the iodide distribution in the brush, lateral and vertical to the substrate. First results indicate an increase of the iodide content at the surface in lateral direction what is paralleled by an increase of brush thickness. Up to now, the vertical distribution of iodide is still unclear but is probed by incorporation of charged gold nanoparticles (Au-NP) along the charge gradient. Penetration depth and distribution of deposited Au-NP was investigated with ellipsometry. Specular and off-specular NR will be used to determine possible internal structures to clarify the potential of PE-brushes as functionalized substrate and as tool for nano-templating. *poly[2-(dimethylamino) ethyl methacrylate]