Regensburg 2007 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 7: POSTER: INTERNAL SYMPOSIUM Scattering Experiments

CPP 7.9: Poster

Monday, March 26, 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.