Regensburg 2007 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 23: Symposium: In situ Optics III
DS 23.2: Vortrag
Donnerstag, 29. März 2007, 10:15–10:30, H34
Infrared in-situ analysis of solid-liquid interface of a mixed polymer brush — •Y. Mikhaylova1, L. Ionov2, M. Gensch1, N. Esser1, J. Rappich3, M. Stamm2, S. Minko4, K.-J. Eichhorn2, and K. Hinrichs1 — 1ISAS - Institute for Analytical Sciences, Department Berlin, Albert-Einstein-Str. 9, 12489 Berlin — 2Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Str. 6, 01069 Dresden — 3Hahn-Meitner-Institut Berlin GmbH, Abt. Silizium-Photovoltaik, Kekuléstr. 5, 12489 Berlin — 4Chemistry Department, Clarkson University, Potsdam, New York 13699, USA
Mixed polymer brushes [1,2] find applications for control of wetability and adhesion because surface properties can be changed by external stimuli (pH, solvent, light, electric field). A mixed poly(2-vinylpyridine)-poly(acrylic acid) polymer grafted layer (mixed P2VP-PAA brush) with 50/50 composition was prepared via two subsequent "grafting to" reactions. The film was characterized in-situ by polarization dependent infrared (IR) spectroscopic measurements in single reflection geometry. During those measurements the brush was exposed to different solutions at varying pH, where conformational rearrangements in the brush and an inversion of the charge of the film occur. The reversible switching of the brush was analyzed in-situ via the component specific vibrational bands of P2VP and PAA. The polarization dependent spectra are interpreted quantitatively by optical simulation procedure. [1] S. Minko, D. Usov, E. Goreshnik, M. Stamm, Macromo. Rapid Commun. 2001, 22, 206; [2] L. Ionov, A. Sidorenko, K.-J. Eichhorn, M. Stamm, S. Minko, K. Hinrichs, Langmuir 2005, 21, 8711