Regensburg 2004 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 15: POSTER: Polymers and Biomaterials
CPP 15.15: Poster
Dienstag, 9. März 2004, 17:00–19:00, B
Investigation of temperature dependent mechanical properties of thin polymer films by AFM — •Andreas Kleiner1, Martin Hinz1, Sabine Hild1, Othmar Marti1, Urs Duerig2, Bernd Gotsmann2, and Tom R. Albrecht2 — 1Dept. of Exp. Physics, University of Ulm, 89069 Ulm — 2IBM Research Division, Zurich Research Laboratory, CH-8803 Rueschlikon
Atomic Force Microscopy provides the possibility to probe mechanical properties on nanometer scale. Combining the AFM with a heating device for sample temperatures up to 420 K enables to investigate mechanical properties and the thermal stability of nanostructures on thin films at temperatures below and above the glass transition. In this study, polymethylmethacrylate films with a molecular weight of 350 kg/mol and a bulk glass transition temperature of 388 K are used, prepared by spin-coating on silicon substrates. The indentation behavior of a AFM tip gives characteristic quantities like stiffness or the energy of hysteresis. In addition to these force curve measurements, the thermal stability of the nanostructures is determined by measuring the time evolution of the topography. The velocity of the observed polymer relaxation as function of the sample temperature reveals clearly the glass transition of the PMMA film.