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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 13: Polymer Physics IV: Thin Films
CPP 13.7: Talk
Tuesday, March 27, 2007, 16:30–16:45, H40
Thin Films of Semifluorinated Liquid Crystalline Side Chain Block Copolymers — •Peter Busch1,2,3, Sitaraman Krishnan2, Marvin Paik2, Gilman Toombes4, Sol Gruner3,4, and Christopher Ober2 — 1JCNS-FRMII, Lichtenbergstr. 1, TU München, 85747 Garching — 2Department of Materials Science and Engineering, Cornell University, USA — 3Cornell High Energy Synchrotron Source (CHESS), Cornell University, USA — 4Department of Physics, Cornell University, USA
Fluorinated materials are interesting as coatings because of their low surface free energies. One possible approach to increase processability is the incorporation of semifluorinated alkenes as side chains to a polymerbackbone, which is part of a diblock copolymer.[1] The side chains arrange into liquid-crystalline, smectic layers, which increases the structural complexity compared to block copolymers with two amorphous blocks.
We present an X-ray study of a thin film of a diblock copolymer consisting of a polystyrene block and a semifluorinated, liquid-crystalline (LC) block. The focus will be the interplay between the self organization of the side chains into smectic layers and the mesoscopic arrangement of the polystyrene blocks with respect to the LC-block, which is strongly related the surface properties of the films.
[1] S. Krishnan, Y.-J. Kwark and C. K. Ober, The Chemical Record, 2004, 4, 315.