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Epitaxial Phase Transformation between Cylindrical and Double Gyroid Mesophases

Published online by Cambridge University Press:  01 February 2011

Lei Zhu
Affiliation:
Polymer Program, Institute of Materials Science and Department of Chemical Engineering, University of Connecticut, Storrs, CT 06269–3136
Lu Sun
Affiliation:
Polymer Program, Institute of Materials Science and Department of Chemical Engineering, University of Connecticut, Storrs, CT 06269–3136
Jianjun Miao
Affiliation:
Polymer Program, Institute of Materials Science and Department of Chemical Engineering, University of Connecticut, Storrs, CT 06269–3136
Li Cui
Affiliation:
Polymer Program, Institute of Materials Science and Department of Chemical Engineering, University of Connecticut, Storrs, CT 06269–3136
Qing Ge
Affiliation:
Maurice Morton Institute and Department of Polymer Science, University of Akron, Akron, OH 44325
Roderic P. Quirk
Affiliation:
Maurice Morton Institute and Department of Polymer Science, University of Akron, Akron, OH 44325
Chenchen Xue
Affiliation:
Maurice Morton Institute and Department of Polymer Science, University of Akron, Akron, OH 44325
Stephen Z. D. Cheng
Affiliation:
Maurice Morton Institute and Department of Polymer Science, University of Akron, Akron, OH 44325
Benjamin S. Hsiao
Affiliation:
Chemistry Department, State University of New York at Stony Brook, Stony Brook, NY 11794
Carlos A. Avila-Orta
Affiliation:
Chemistry Department, State University of New York at Stony Brook, Stony Brook, NY 11794
Igors Sics
Affiliation:
Chemistry Department, State University of New York at Stony Brook, Stony Brook, NY 11794
Marie E. Cantino
Affiliation:
Department of Physiology and Neurobiology, University of Connecticut, Storrs, CT 06269
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Abstract

Complex phase transformation between the hexagonal cylinder (Hex) and double gyroid (G) phases in a polystyrene-block-poly(ethylene oxide) (PS-b-PEO) diblock copolymer was investigated using two-dimensional (2D) synchrotron small-angle X-ray scattering (SAXS), and transmission electron microscope (TEM). The PS-b-PEO sample contained a small population of another bicontinuous cubic phase having an Im 3 m symmetry. These two bicontinuous cubic phases (G and Im 3 m) had the same unit cell dimensions. Under a large-amplitude reciprocating shear, the bicontinuous cubic phases transformed into a “single-crystal”-like Hex phase. When annealed at 150 °C for 40 min, the Hex phase partially transformed into well-oriented twinned structures of the G and Im 3 m phases without significant loss of orientation in 2D SAXS measurements. Epitaxial phase transformation relationships between the Hex/G and Hex/ Im 3 m phases were identified. The mechanism of the Hex → G transformation was examined by TEM.

Type
Research Article
Copyright
Copyright © Materials Research Society 2005

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