Article
Symmetry Breaking of In-Plane Order in Confined Copolymer Mesophases
Physical Review Letters
(2007)
Abstract
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.
Keywords
- asymptotic analysis,
- block copolymers,
- phase transitions,
- thermodynamic properties,
- thin films,
- copolymer mesophases,
- field theory,
- crystal structure
Disciplines
Publication Date
April, 2007
Publisher Statement
Reprinted with permission from Stein, G.E., Cochran, E.W., Katsov, K., Fredrickson, G.H., Kramer, E.J., Li, X., Wang, J.
Symmetry breaking of in-plane order in confined copolymer mesophases
(2007) Physical Review Letters, 98 (15), art. no. 158302, . DOI: 10.1103/PhysRevLett.98.158302. Copyright 200 American Physical Society.
Citation Information
G. E. Stein, Eric W. Cochran, K. Katsov, G. H. Fredrickson, et al.. "Symmetry Breaking of In-Plane Order in Confined Copolymer Mesophases" Physical Review Letters Vol. 98 Iss. 15 (2007) Available at: http://works.bepress.com/eric_cochran/17/