Berlin 2005 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 30: POSTER: Chemical physics

CPP 30.60: Poster

Tuesday, March 8, 2005, 16:30–18:30, Poster TU D

Dewetting of confined polymer films — •E. Bauer and P. Müller-Buschbaum — TU-München, James-Franck-Str.1, 85747 Garching

Dewetting is of major interest in many applications such as coatings and dielectrics. We investigated the dewetting behavior of ultra-thin (confined) polystyrene films on top of differently cleaned Si-substrates by exposure to heat load. The samples were probed by AFM and GISAXS. We found out that the dewetting is modifed upon the type of cleaning procedure applied. Time scales as well as final states are different. The time dependent hole growth differs from the common slip or non-slip condition. By cleaning a thickness change of the native oxide layer is reported which alters the wall potential. An analysis of the wall potential leads to a relation of the differing time scales to binodal and spinodal mechanisms. Characterizing the near equilibrium states by an analyse of the contact angle between substrate and polymer again showed the importance of short range contributions in the wall potential. By cleaning, the physics of the system is seriously affected [1, 2].

[1] P.Müller-Buschbaum, Euro. Phys. J. E 12, 443 (2003)

[2] E.Bauer, P.Müller-Buschbaum, to be published