Dresden 2006 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 1: Thin Films and Surfaces I

CPP 1.1: Hauptvortrag

Montag, 27. März 2006, 09:30–10:00, ZEU Lich

Polymer Thin Films and Mixed Brushes: Some Applications to Nanoscience — •Manfred Stamm — Leibniz Institute of Polymer Research Dresden, Germany

Polymers exhibit interesting properties that are used in the bulk, but can similarly provide interesting aspects with thin films. Crosslinked polymer networks thus can be highly swollen in solvents, and with a thin polymer bilayer film this effect may be utilized to produce nanotubes by scrolling of the film /1/, when the lower layer is swollen by the solvent while the upper layer is inert. The film can be patterned at the surface and the structure transferred to the inner surface of the tube formed. A fairly robust way of surface functionalization is the attachment of polymer chains to the surface by covalent bonding. At high grafting density a brush-like layer will be formed, and surface properties can be changed significantly. Utilizing mixed polymer brushes the surface properties can be switched between different states due to local phase segregation /2/, and it is even possible to switch between ultra-hydrophobic and ultra-hydrophilic behavior by introduction of an additional surface roughness. Mixed polymer brushes may be used for the control of protein adsorption or the separation of liquids by the effect of controlled surface interaction.

/1/ V. Luchnikov, M. Stamm, O. Sydorenko, Advanced Materials, 17, 1177-1182 (2005) /2/ L. Ionov, B. Zdyrko, A. Sidorenko, S. Minko, V. Klep, I. Luzinov, M. Stamm, Macromolecular Rapid Communications, 25, 360-365 (2004)