Regensburg 2007 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 7: POSTER: INTERNAL SYMPOSIUM Scattering Experiments
CPP 7.9: Poster
Montag, 26. März 2007, 16:00–18:00, Poster B
Thin films of diblock copolymers having one crystalline block — •charles Darko1, ezzeldin Metwalli1, ioan Botiz2, günter Reiter2, dag w Breiby3, stephan v Roth4, detlef-m Smilgies5, and christine m Papadakis1 — 1Physikdepartment E13, TU München, James-Franck-Str. 1, D-85747 Garching — 2Institut de Chimie de Surfaces et Interfaces, CNRS, Mulhouse, France — 3Niels Bohr Institute, University of Copenhagen, Denmark — 4Hasylab at DESY, Hamburg — 5CHESS, Cornell University, Ithaca NY, USA
In thin films of semicrystalline diblock copolymers, the final structure formed depends on the competition between (i) the order-disorder transition of the diblock copolymer, (ii) the crystallization of the crystallisable block, and (iii) the vitrification of the amorphous block. We have studied lamellae-forming poly(styrene-b-ethylene oxide) diblock copolymers differing in molar mass. Combining grazing-incidence small and wide-angle X-ray scattering with high-resolution grazing-incidence X-ray diffraction, we obtain information on the inner structures on a large range of length scales and can compare them to the surface textures from optical and atomic-force microscopy. For the lowest molar mass sample, we find that the surface textures are different from the ones of poly(ethylene oxide) homopolymer films and that, depending on crystallization temperature, confined crystallization or breakout occur.