Influence of initial order on the microscopic mechanism of electric field induced alignment of block copolymer microdomains

Schmidt, Kristin and Boker, Alexander and Zettl, Heiko and Schubert, Frank and Hansel, Helmut and Fischer, Franz and Weiss, Thomas M. and Abetz, Volker and Zvelindovsky, Andrei and Sevink, G. J. A. and Krausch, Georg (2005) Influence of initial order on the microscopic mechanism of electric field induced alignment of block copolymer microdomains. Langmuir, 21 (25). pp. 11974-11980. ISSN 0743-7463

Full content URL: http://pubs.acs.org/doi/abs/10.1021/la051346w

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Influence of initial order on the microscopic mechanism of electric field induced alignment of block copolymer microdomains

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Abstract

We investigate the mechanism of microdomain orientation in concentrated block copolymer solutions exposed to a dc electric field by in situ synchrotron small-angle X-ray scattering (SAXS). As a model system, we use concentrated solutions of a lamellar polystyrene-b-polyisoprene block copolymer in toluene. We find that both the microscopic mechanism of reorientation and the kinetics of the process strongly depend on the initial degree of order in the system. In a highly ordered lamellar system with the lamellae being aligned perpendicular to the electric field vector, only nucleation and growth of domains is possible as a pathway to reorientation and the process proceeds rather slowly. In less ordered samples, grain rotation becomes possible as an alternative pathway, and the process proceeds considerably faster. The interpretation of our finding is strongly corroborated by dynamic self-consistent field simulations. © 2005 American Chemical Society.

Keywords:Computer simulation, Electric field effects, Polystyrenes, Reaction kinetics, Rotation, Vectors, X ray scattering, Block copolymer microdomains, Lamellar system, Microscopic mechanism, Small-angle X-ray scattering (SAXS), Block copolymers
Subjects:F Physical Sciences > F162 Polymer Chemistry
Divisions:College of Science > School of Mathematics and Physics
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ID Code:14980
Deposited On:23 Sep 2014 11:05

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