Symmetry breaking of in-plane order in confined copolymer mesophases

Packing of spherical-domain block copolymer mesophases confined to a thin film is investigated as a function of the number of layers n. We find an abrupt transition from hexagonal to orthorhombic in-plane ordering of domains when n is increased from 4 to 5. As n increases further (up to 23 in this s...

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Bibliographic Details
Published in:Physical review letters 2007-04, Vol.98 (15), p.158302-158302, Article 158302
Main Authors: Stein, G E, Cochran, E W, Katsov, K, Fredrickson, G H, Kramer, E J, Li, X, Wang, J
Format: Article
Language:English
Subjects:
COPOLYMERS
LIQUID CRYSTALS
MATERIALS SCIENCE
ORDER PARAMETERS
SYMMETRY BREAKING
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Summary:Packing of spherical-domain block copolymer mesophases confined to a thin film is investigated as a function of the number of layers n. We find an abrupt transition from hexagonal to orthorhombic in-plane ordering of domains when n is increased from 4 to 5. As n increases further (up to 23 in this study), the symmetry of the orthorhombic phase asymptotically approaches that of the body-centered cubic (110) plane. These results are interpreted in terms of the energetics of competing packings in the bulk and at the film interfaces. Detailed structural and thermodynamic properties are obtained with self-consistent field theory.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.98.158302