Dresden 2006 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 1: Thin Films and Surfaces I
CPP 1.9: Vortrag
Montag, 27. März 2006, 12:00–12:15, ZEU Lich
Micro-focus GISAXS Investigation of Polymer Brushes — •Jochen S. Gutmann1,2, Gina-Gabriela Bumbu1, Markus Wolkenhauer1, Yajun Cheng1, and Rüdiger Berger1 — 1Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany — 2Institute for Physical Chemistry, Johannes Gutenberg University Mainz, Welderweg 11, D-55099 Mainz, Germany
Polymer brushes are selective coatings for micromechanical cantilever (MC) sensors, enabling the use of MC sensor technology in liquid environments. To prepare covalently grafted polymer layers on MC sensors, a poly(methyl methacrylate) (PMMA) brush layer was grown using a grafting-from ATRP synthesis [1]. The brush layer acts as a sensing layer when brought into contact with different solvents. In our experiments we have noticed that the deflection/stress of the PMMA covered MC after the first swelling systematically differs from the values before swelling. This behaviour may be assigned to a structural ’memory’ of previous treatments, i.e. the solvent/non-solvent used and the drying procedure. We therefore focus on the influence of the solvent used for swelling on the morphology of the dried PMMA brushes. In order to investigate the lateral structure of the brush layer on the µm sized cantilevers, we used a micro-focus set-up for X-ray scattering under grazing incidence (µ-GISAXS), at the BW4 beam line.
[1] Bumbu G.-G., Kircher G., Wolkenhauer M., Berger R., Gutmann J.S., Macromol. Chem. Phys. 2004, 205 (13): 1713-1720