Microdomain Morphology of Lamella-Forming Diblock Copolymer Confined in a Thin Film

摘要

We report the self-consistent field theory (SOFT) of the morphology of lamella-forming diblock copolymer thin films confined in two horizontal symmetrical/asymmetrical surfaces. The morphological dependences of thin films on the polymer-surface interactions and confinement, such as film thickness and confinement spatial structure, have been systematically investigated. Mechanisms of the morphological transitions can be understood mainly through the polymer-surface interactions and confinement entropy, in which the plat confinement surface provides a surface-induced effect. The confinement is expressed in the form of the ratio D/L-0, here D is film thickness, and L-0 is the period of bulk lamellar-structure. Much richer morphologies and multiple surface-induced morphological transitions for the lamella-forming diblock copolymer thin films are observed, which have not been reported before. (C) 2008 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 47: 1-10, 2009