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Electric-Field-Induced Order-Order Transition from Hexagonally Perforated Lamellae to Lamellae

  • Block copolymers form a variety of microphase morphologies due to their ability to phase separate. The hexagonally perforated lamellar (HPL) morphology represents an unusually long-lived, nonequilibrium transient structure between lamellar and cylindrical phases. We present a detailed study of a concentrated, HPL-forming poly(styrene-b-isoprene) diblock copolymer solution in toluene in the presence of an electric field. We will show that this phase is readily aligned by a moderate electric field and provide experimental evidence for an electric-field-induced order order transition toward the lamellar phase under sufficiently strong fields. This process is shown to be fully reversible as lamellar perforations reconnect immediately upon secession of the external stimulus, recovering highly aligned perforated lamellae.

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Author:Christian W. Pester, Kristin Schmidt, Markus Ruppel, Heiko G. Schoberth, Alexander BökerORCiDGND
ISSN:0024-9297 (print)
ISSN:1520-5835 (online)
Parent Title (English):Macromolecules : a publication of the American Chemical Society
Publisher:American Chemical Society
Place of publication:Washington
Document Type:Article
Year of first Publication:2015
Year of Completion:2015
Release Date:2017/03/27
First Page:6206
Last Page:6213
Funder:Alexander von Humboldt Foundation
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie
Peer Review:Referiert