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In equilibrium the interface potential that describes the interaction betweentwo AB interfaces in a binary blend of A and B homopolymers is attractive atall distances, resulting in coarsening of the blend morphology even in theabsence of interface curvature. We demonstrate that the dissipative assembly inresponse to a time-periodic variation of the blend incompatibilityqualitatively alters this behavior, i.e., for suitable parameters the interfacepotential exhibits a periodic spatial modulation and AB interfaces adopt awell-defined distance. We explore for which oscillation periods and amplitudesan interface repulsion occurs and demonstrate that we can control the preferredinterface distance over a wide range by varying the oscillation period. Usingparticle-based simulations we explicitly demonstrate that this dissipativeassembly of a homopolymer blend results in a lamellar structure with multipleplanar interfaces in a thin film geometry.

Interface repulsion and lamellar structures in thin films of homopolymer blends due to thermal oscillations