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Surface induced ordering in thin film diblock copolymers: Tilted lamellar phases

Summary: Surface induced ordering in thin film diblock copolymers: Tilted
lamellar phases
Y. Tsoria)
and D. Andelmanb)
School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv
University, 69978 Ramat Aviv, Tel Aviv, Israel
Received 29 March 2001; accepted 25 April 2001
We investigate the effect of chemically patterned surfaces on the morphology of diblock copolymers
below the order­disorder transition. Profiles for lamellar phases in contact with one surface, or
confined between two surfaces are obtained in the weak segregation limit using a Ginzburg­Landau
expansion of the free energy, and treating it with mean-field theory. The periodically patterned
surface induces a tilt of the lamellae in order to match the surface periodicity. The lamellae relax
from the constrained periodicity close to the surface to the bulk periodicity far from it. The phases
we investigate are a generalization to the mixed perpendicular and parallel to the surface lamellar
phases occurring when the two surfaces are homogeneous. A special case when the surface pattern
has a period equal to the bulk lamellar period showing ``T-junction'' morphology is examined. Our
analytic calculation agrees with previous computer simulations and self-consistent field theories.
© 2001 American Institute of Physics. DOI: 10.1063/1.1379759
Diblock copolymers are made up of two chemically dis-


Source: Andelman, David - School of Physics and Astronomy, Tel Aviv University


Collections: Materials Science; Physics