Dislocation-Controlled Perforated Layer Phase in a PEO- b-PS Diblock Copolymer

Lei Zhu, Ping Huang, Stephen Z. D. Cheng, Qing Ge, Roderic P. Quirk, Edwin L. Thomas, Bernard Lotz, Jean-Claude Wittmann, Benjamin S. Hsiao, Fengji Yeh, and Lizhi Liu
Phys. Rev. Lett. 86, 6030 – Published 25 June 2001
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Abstract

Small angle x-ray analyses show that the shear-induced hexagonal perforated layer phase in a poly(ethylene oxide)- b-polystyrene diblock copolymer consists of trigonal ( R3¯m) twins and a hexagonal ( P63/mmc) structure, with trigonal twins being majority components. Transmission electron microscopy reveals that the hexagonal structure is generated through sequential intrinsic stacking faults on the second layer from a previous edge dislocation line, while the trigonal twins are formed by successive intrinsic stacking faults on neighboring layers due to the plastic deformation under mechanical shear.

  • Received 8 March 2001

DOI:https://doi.org/10.1103/PhysRevLett.86.6030

©2001 American Physical Society

Authors & Affiliations

Lei Zhu1, Ping Huang1, Stephen Z. D. Cheng1,*, Qing Ge1, Roderic P. Quirk1, Edwin L. Thomas2, Bernard Lotz3, Jean-Claude Wittmann3, Benjamin S. Hsiao4, Fengji Yeh4, and Lizhi Liu4

  • 1Maurice Morton Institute and Department of Polymer Science, The University of Akron, Akron, Ohio 44325-3909
  • 2Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
  • 3Institute Charles Sadron, 6 Rue Boussingault, Strasbourg 67083, France
  • 4Department of Chemistry, The State University of New York at Stony Brook, Stony Brook, New York 11794-3400

  • *To whom correspondence should be addressed. Email address: cheng@polymer.uakron.edu

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Vol. 86, Iss. 26 — 25 June 2001

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