APS » PROLA » Phys. Rev. Lett. » Volume 86 » Issue 26

Phys. Rev. Lett. 86, 6030 - 6033 (2001)

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

Received 8 March 2001

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 ( R3̅ 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.


©2001 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v86/p6030
DOI: 10.1103/PhysRevLett.86.6030
PACS: 82.35.Jk, 61.72.Ff, 82.35.Lr, 83.80.Uv

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

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