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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 14: Poster: Interfaces and Thin Films

CPP 14.2: Poster

Montag, 22. März 2010, 16:30–18:00, Poster C

Elastic properties of thin transparent polymer films — •Johannes Wiedersich, Alexander Diethert, Peter Müller-Buschbaum, and Winfried Petry — Physikdepartment E13, TU München, Garching

The method of Brillouin scattering has recently been extended from bulk samples to the application of thin and ultra thin transparent polymer films. The method provides a means to investigate mechanical properties of films with thickness in the nm range in a contactless in-situ manner. Theoretical computations predict a complicated pattern of propagating film and surface guided modes, depending on the thickness and on the mechanical properties of the films, which are spin coated on glass substrates.

We have been able to improve the sensitivity of our Brillouin scattering set-up and extend measurements down to ultra-thin films. The first results on our thinnest films show deviations from the theoretical predictions and indicate that the mechanical modulus deviates from the bulk value for films with thickness on the order of 20 nm.