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SYPF: Struktur und Dynamik in dünnen Polymerfilmen

SYPF 1: Structure and Dynamics in Thin Polymer Films

SYPF 1.3: Fachvortrag

Donnerstag, 14. März 2002, 09:40–10:10, H37

Structure formation and reorganization of lamellae in thin diblock copolymer films — •Christine M. Papadakis¹, Peter Busch¹, Detlef-M. Smilgies², Dorthe Posselt³, and Friedrich Kremer¹ — ¹Faculty of Physics, University of Leipzig, 04103 Leipzig — ²CHESS, Cornell University, USA — ³Roskilde University, Denmark

Block copolymer films can be used for patterning surfaces on a submicrometer length scale. The surface structures of such films are easily accessible by AFM. Grazing-incidence small-angle X-ray scattering (GISAXS) and X-ray reflectometry elucidate the lateral and vertical inner film structure in detail. In this way we have found a characteristic molar-mass dependence of the thin film structures of lamellae-forming symmetric polystyrene-polybutadiene (PS-PB) diblock copolymers [1]. Whereas films from low molar mass samples prefer a lamellar orientation parallel to the film surfaces, the lamellae are perpendicular in high molar mass samples. For intermediate molar mass samples domains of different orientations coexist. Additionally, time-resolved GISAXS gives information about changes of the inner film structures during vapor treatment, which are compared to changes of the surface structures detected using AFM.

[1] P. Busch et al., submitted