Orientation-Dependent Order-Disorder Transition of Block Copolymer Lamellae in Electric Fields

Titelangaben

Schoberth, Heiko G. ; Pester, Christian W. ; Ruppel, Markus ; Urban, Volker S. ; Böker, Alexander:
Orientation-Dependent Order-Disorder Transition of Block Copolymer Lamellae in Electric Fields.
In: ACS Macro Letters. Bd. 2 (2013) Heft 6 . - S. 469-473.
ISSN 2161-1653
DOI: https://doi.org/10.1021/mz400013u

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Abstract

Electric fields have been shown to stabilize the disordered phase of near-critical block copolymer solutions. Here, we use in situ synchrotron small-angle X-ray scattering to examine how the initial orientation of lamellar domains with respect to the external field (phi) affects the shift in the order-disorder transition temperature (T_ODT ) of lyotropic solutions of poly(styrene-b-isoprene) in toluene. We find a downward shift of the transition temperature, which scales with lamellar orientation as Delta T_ODT ~ cos^2(phi), in accordance with theory.