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CPP: Chemische Physik und Polymerphysik

CPP 29: POSTER: Polymer physics

CPP 29.3: Poster

Dienstag, 8. März 2005, 16:30–18:30, Poster TU D

Frequency dependence of mechanical properties of thin polymer films — •Michael Holzwarth, Andreas Kleiner, Martin Hinz, Alexander Gigler, Sabine Hild, and Othmar Marti — Department of Experimental Physics, University of Ulm, 89069 Ulm, Germany

It is well known from measurements on bulk polymer samples that their mechanical properties reveal a certain frequency dependence. These materials have already been investigated on a nanometer scale with AFM techniques such as force-distance-curves at low frequencies (1 Hz) and Pulsed-Force Mode at higher frequencies (1 kHz). The aim of our work is to investigate the frequency-dependent behaviour in the intermediate range. We use AFM cantilevers to perform nanoindentations on thin films of PMMA (Polymethylmethacrylate) spin-coated on a silicon substrate. Force-distance-curves are evaluated to reveal the mechanical properties of the polymer. The remanent depth of the indentations will be shown as a function of frequency and maximum applied load.