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INTERFACE SCIENCE 11, 259268, 2003 c 2003 Kluwer Academic Publishers. Manufactured in The Netherlands.

Summary: INTERFACE SCIENCE 11, 259268, 2003
c 2003 Kluwer Academic Publishers. Manufactured in The Netherlands.
Ordering Mechanisms in Confined Diblock Copolymers
ESPCI, 10 Rue Vauquelin, Paris 75231, Cedex 05, France
School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences,
Tel Aviv University, Ramat Aviv, Tel Aviv 69978, Israel
Abstract. We present several ordering mechanisms in diblock copolymers. For temperatures above the order-
disorder temperature and in the weak segregation regime, a linear response theory is presented which gives the
polymer density in the vicinity of confining flat surfaces. The surfaces are chemically patterned where different
regions attract different parts of the copolymer chain. The surface pattern or template is decomposed into its Fourier
modes, and the decay of these modes is analyzed. The propagation of the surface pattern into the disordered
bulk is given for several types of patterns (e.g. uniform and striped surface). It is further shown that complex
morphology can be induced in a thin film even though the bulk is disordered. We next consider lamellar diblock
copolymers (low temperature regime) in the presence of a striped surface. It is shown that lamellae acquire a tilt
with respect to the surface, if the surface periodicity is larger than the bulk one. The lamellae close to the surface are
strongly distorted from their perfect shape. When the surface and lamellar periodicities are equal, the lamellae are
perpendicular to the surface. Lastly, the transition from parallel to perpendicular lamellae in a thin film is presented.


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


Collections: Materials Science; Physics