We examine the effects of small-scale, hexagonal, lateral confinement on microdomain ordering in $AB$ diblock copolymer thin films using self-consistent field theory (SCFT) simulations. Specifically, we examine a hexagonal confinement well with side length $L$ approximately equal to five cylindrical microdomain lattice spacings. The commensurability constraints of the small-scale lateral confinement, coupled with surface-induced effects allows the confining well to have a significant effect on the perfection of microdomain order. We identify commensurability windows in $L$ that depend on the segment wall interaction, and the ``temperature'' annealing rate (modeled as a Flory $\chi ~ 1/T$ annealing rate). The effect of added majority-block homopolymer is also explored.
Pub Type: Journals
block copolymers, commensurability, lateral confinement, mean-field, self-assembly, simulations, surface-directed ordering, thin films