Regensburg 2002 – wissenschaftliches Programm
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 . 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.
 P. Busch et al., submitted