Regensburg 2010 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 14: Poster: Interfaces and Thin Films
CPP 14.14: Poster
Montag, 22. März 2010, 16:30–18:00, Poster C
Very slow breakout crystallization in cylinder-forming diblock copolymer thin films — •Christine M. Papadakis1, Charles Darko1, Zhenyu Di1, Kordelia Troll1, Ezz Metwalli1, Andreas Timmann2, Günter Reiter3, and Stephan Förster4 — 1TU München, Physikdepartment E13, Garching — 2HASYLAB at DESY, Hamburg — 3Albert-Ludwigs-Universität Freiburg, Fakultät für Physik und Mathematik — 4Universität Hamburg, Department Chemie
In thin polymer films, crystallization often leads to fascinating surface structures. We have investigated the long-term behavior of the crystallization in thin films of cylinder-forming poly(isoprene-b-ethyleneoxide), PI-b-PEO. Using optical microscopy, AFM, X-ray reflectometry and grazing-incidence wide- and small-angle X-ray scattering, we have observed very slow breakout crystallization of the PEO. The crystallization of the film was complete only after 150 days. The original hexagonal morphology was destroyed by crystalline lamellae lying in the film plane. The PEO chain stems were perpendicular to the film plane. We attribute this slow breakout to the shortness of the PEO blocks which change from being amorphous in the confinement of the cylinders to twice-folded in the lamellae.