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Ordered Morphologies of Confined Diblock Copolymers Yoav Tsori and David Andelman
 

Summary: Ordered Morphologies of Confined Diblock Copolymers
Yoav Tsori and David Andelman
School of Physics and Astronomy
Raymond and Beverly Sackler Faculty of Exact Sciences
Tel Aviv University, 69978 Ramat Aviv, Israel
ABSTRACT
We investigate the ordered morphologies occurring in thin-films diblock copolymer. For
temperatures above the order-disorder transition and for an arbitrary two-dimensional surface
pattern, we use a Ginzburg-Landau expansion of the free energy to obtain a linear response
description of the copolymer melt. The ordering in the directions perpendicular and parallel to
the surface are coupled. Three dimensional structures existing when a melt is confined
between two surfaces are examined. Below the order-disorder transition we find tilted
lamellar phases in the presence of striped surface fields.
INTRODUCTION
The self-assembly of block copolymers (BCP) has been the subject of numerous studies
[1]-[12]. These macromolecules are made up of chemically distinct subunits, or blocks, linked
together with a covalent bond. This bonding inhibits macrophase separation, and leads to
formation of mesophases with typical size ranging from nanometers up to microns. For
di-block copolymers, which are made up of two partially incompatible blocks (A and B), the
phase diagram is well understood [1]-[6], and exhibits disordered, lamellar, hexagonal and

  

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

 

Collections: Materials Science; Physics