Regensburg 2010 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 14: Poster: Interfaces and Thin Films
CPP 14.20: Poster
Montag, 22. März 2010, 16:30–18:00, Poster C
Alignment Mechanism of SVT Polymer Thin Films and its 3-Dimensional Characterization: A Combined QIS-SFM Imaging Study — •Clemens Liedel1, Markus Hund2, Violetta Olszowka2, and Alexander Böker1 — 1Lehrstuhl für Makromolekulare Materialien und Oberflächen and DWI an der RWTH Aachen e.V., RWTH Aachen University, D-52056 Aachen, Germany — 2Lehrstuhl für Physikalische Chemie II, Universität Bayreuth, D-95440 Bayreuth, Germany
We observe the direct current electric field induced alignment in thin polymer films with cylindrical morphology basing on a hexagonal superstructure.
So far, little is known about the exact mechanism leading to microdomain orientation of polymer systems in the border region between cylinders and perforated lamellae. Here, we describe quasi in-situ scanning force microscopy (QIS-SFM) measurements on thin films of a linear polystyrene-b-poly(2-vinylpyridine)-b-poly(tert-butyl methacrylate) triblock copolymer under an electric field. The alignment process is followed using a new SFM design which enables solvent vapor and electric field treatment after each scanning cycle.
The orientation mechanism is studied and compared to the mechanisms in lamellar block copolymer morphologies. Rotation and nucleation-and-growth mechanisms and defect movement, basing on a hexagonal superstructure, are observed leading to a long-range ordered morphology of aligned core-shell cylinders.
Correspondence to boeker@dwi.rwth-aachen.de