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

Christian Pester, Kristin Schmidt, Markus Ruppel, Heiko G. Schoberth, Alexander Böker

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)6206-6213
Number of pages8
JournalMacromolecules
Volume48
Issue number17
DOIs
StatePublished - Sep 8 2015

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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