Berlin 2008 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 31: Thin Films
CPP 31.3: Vortrag
Donnerstag, 28. Februar 2008, 10:00–10:15, C 264
Phase behaviour of ultra-thin polymer films grafted on Micro-Cantilever-Sensors (MCS) — •Sebastian Lenz1, Sebastian K. Nett1,2, Mine Memesa1, Rüdiger Berger1, Jochen S. Gutmann1,2, Andreas Timmann3, and Stephan V. Roth3 — 1Max-Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz (Germany) — 2Institute for Physical Chemistry, Johannes Gutenberg University, Jakob-Welder-Weg 10, D-55099 Mainz (Germany) — 3HASYLAB at DESY, Notkestr. 85, D-22603 Hamburg (Germany)
Phase behaviour of polymer films plays an important role to tailor surface properties of materials. Using a polymer blend mixture with a lower miscibility gap, we anticipate a phase transition from a one phase towards a two phase system upon changing temperature. As a suitable system a polymer blend composed of polystyrene (PS) and poly-vinyl-methyl-ether (PVME) [1] is chosen.
During phase transition, we want to correlate structural changes in the grafted polymer layer to surface stress induced curvature changes of the MCS over time. To study structural features in the nanometre scale and due to the small sample size of a polymer-coated cantilever we have to use recently developed characterization techniques. A combination of micro-focused Grazing Incident Small Angle Scattering (GISAXS) [2] and micro-focused X-Ray reflectivity was chosen to obtain structural information of the systems.
[1] Tanaka et al., Macromolecules 28, (1995) 934-938.
[2] S.V. Roth et al., Rrv. Sci. Instr. 77, (2006) 085106.