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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 68: Hydrogels and Microgels II
CPP 68.5: Vortrag
Freitag, 24. März 2017, 11:15–11:30, ZEU 260
Analysis of PDMAEMA Polymer Brushes: A TOF-SIMS Study — •Marc Thomas1,2, Ulrich Hagemann2,3, Steffen Franzka2,3, Mathias Ulbricht1,2, and Nils Hartmann1,2,3 — 1Chemistry Department, University of Duisburg-Essen, Germany — 2Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Germany — 3Interdisciplinary Center for Analytics on the Nanoscale (ICAN), University of Duisburg-Essen, Germany
Stimuli-responsive polymer brushes are widely applicable, i.e. for self-cleaning coatings, switchable adsorbers and sensors. Using controlled reaction schemes, e.g. ATRP (atom transfer radical polymerization), tailor-made ultrathin brushes can be synthesized. These brushes respond reversibly to stimuli, e.g. temperature, pH, or biomolecules within micro-/milliseconds. Hence, these brushes pose a pathway to innovative miniaturized devices. Tailoring the brushes towards bioapplications requires an insight on their inner structure without and with biomolecules. Here, TOF-SIMS has been applied to obtain three-dimensional molecular information from PDMAEMA (Poly(N,N-dimethylaminoethyl methacrylate) brushes with nm depth resolution. For varying initiator densities, the relative density of initiator prior and after the polymerization as well as the polymer chain density has been obtained. Further, the distribution of BSA (bovine serum albumin) has been examined. The TOF-SIMS experiments were complemented by XPS, AFM and fluorescence spectroscopy measurements. The results reveal the inner structure of polymer brushes of varying grafting densities without and with protein.