Diblock copolymer sphere morphology in ultra thin films under shear

Pinna, Marco and Zvelindovsky, Andrei and Guo, X. and Stokes, C. L. (2011) Diblock copolymer sphere morphology in ultra thin films under shear. Soft Matter, 7 (15). pp. 6991-6997. ISSN 1744-683X

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Diblock copolymer sphere morphology in ultra thin films under shear

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Abstract

We demonstrate that the shear alignment and the shear-induced transitions in sphere-forming diblock copolymer single layer and bilayer films observed experimentally Y.-R Hong, D. H. Adamson, P. M. Chaikin and R. A. Register, Soft Matter, 2009, 5, 1687 can be explained by cell dynamics simulation, a simple model with a Ginzburg-Landau Hamiltonian. In two layer films the spheres align in various arrangements, like (100) or (110) bcc planes, or transform to cylinders depending on the shear rate and the temperature. For the first time, we present a nontrivial alignment mechanism of a single layer of spherical domains in shear via slug-like movement of transient cylindrical micelles. In addition, we clarify the formation of the perpendicular cylinders, found in the recent particle based simulation A. Chremos, K. Margaritis, A. Z. Panagiotopoulos, Soft Matter, 2010, 6, 3588. © 2011 The Royal Society of Chemistry.

Keywords:Alignment mechanism, Bi-layer films, Cell dynamics, Cylindrical micelles, Diblock copolymer, Ginzburg-Landau Hamiltonian, Particle-based simulation, Shear alignment, Single layer, Soft matter, Spherical domain, Two-layer films, Alignment, Block copolymers, Computer simulation, Copolymerization, Cylinders (shapes), Shear deformation, Spheres
Subjects:F Physical Sciences > F170 Physical Chemistry
Divisions:College of Science > School of Mathematics and Physics
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ID Code:14913
Deposited On:16 Sep 2014 11:04

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