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Reentrant ordering transition of asymmetric copolymer solution film confined between polymer-grafted surfaces
1National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China.
Abstract:
We study the equilibrium morphology of an asymmetric A-B diblock copolymer solution film confined between homopolymer-grafted substrates by using self-consistent-field calculations. We find that on decreasing the copolymer concentration, a reentrant structural transformation between hexagonal --> lamellar --> hexagonal phases occurs as a result of the competition between the wetting effect of the brush surface and the bulk phase behavior of the asymmetric copolymer driven by the A-B interfacial tension.
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