Parallel and vertical morphologies in block copolymers of cylindrical domain

Abstract

We present a theoretical result on the ordering of cylindrical morphology in diblock and triblock copolymers. The equilibrium morphology of $\mathrm{A–B}$ diblock and $\mathrm{A–B–A}$ triblock copolymer films is shown to have the cylinders oriented parallel or vertical to the surface, depending on the film thickness and surface tensions. A criterion is derived that can be used to determine the conditions under which the orientation is parallel or vertical.