Scaling behavior of the reorientation kinetics of block copolymers exposed to electric fields

Schmidt, K. and Schoberth, H. G. and Schubert, F. and Hansel, H. and Fischer, F. and Weiss, T. M. and Sevink, G. J. A. and Zvelindovsky, Andrei and Boker, A. and Krausch, G. (2007) Scaling behavior of the reorientation kinetics of block copolymers exposed to electric fields. Soft Matter, 3 (4). pp. 448-453. ISSN 1744-683X

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Scaling behavior of the reorientation kinetics of block copolymers exposed to electric fields

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Abstract

We have followed the reorientation kinetics of various block copolymer solutions exposed to an external electric DC field. The characteristic time constants follow a power law indicating that the reorientation is driven by a decrease in electrostatic energy. Moreover, the observed exponent suggests an activated process in line with the expectations for a nucleation and growth process. When properly scaled, the data collapse onto a single master curve spanning several orders of magnitude both in reduced time and in reduced energy. The power law dependence of the rate of reorientation derived from computer simulations based on dynamic density functional theory agrees well with the experimental observations. First experiments in AC electric fields at sufficiently high frequencies confirm the notion that the reorientation process is dominated by differences in the dielectric constants rather than by mobile ions. © The Royal Society of Chemistry 2007.

Keywords:Computer simulation, Data acquisition, Density functional theory, Electric field effects, Growth (materials), Nucleation, Permittivity, Curve spanning, Mobile ions, Reorientation kinetics, Time constants, Block copolymers
Subjects:F Physical Sciences > F162 Polymer Chemistry
Divisions:College of Science > School of Mathematics and Physics
ID Code:14972
Deposited On:23 Sep 2014 07:36

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