Berlin 2001 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 4: Thin Polymer Films

CPP 4.4: Vortrag

Dienstag, 3. April 2001, 16:45–17:05, 111

Surface and inner film structures in thin diblock copolymer films — •Peter Busch¹, Dorthe Posselt², Detlef Smilgies³, Friedrich Kremer¹, and Christine M. Papadakis¹ — ¹Fakultät für Physik, Universität Leipzig, D-04103 Leipzig — ²IMFUFA, Roskilde University, DK-4000 Roskilde, Denmark — ³European Synchrotron Radiation Facility, F-38043 Grenoble, France

Block copolymer films have recently been used for patterning surfaces on a submicrometer length scale, and the surface structures of such films have been investigated thoroughly. However, the internal film structure, which is determined by the film thickness, the interfacial tensions of the two blocks at the interfaces, but also by kinetic effects during the film preparation, often differs from the surface structure. We have studied spin-coated thin films of a homologous series of symmetric polystyrene-polybutadiene (PS-PB) diblock copolymers in a wide range of molar masses. The surface structures were investigated using tapping mode AFM [1]. Grazing-incidence small-angle X-ray scattering allowed us to gain information on the lateral and vertical inner film structure. We find a characteristic molar-mass dependence of the structures.

[1] P. Busch et al., Surface and Interface Analysis, submitted.