  In equilibrium the interface potential that describes the interaction between
two AB interfaces in a binary blend of A and B homopolymers is attractive at
all distances, resulting in coarsening of the blend morphology even in the
absence of interface curvature. We demonstrate that the dissipative assembly in
response to a time-periodic variation of the blend incompatibility
qualitatively alters this behavior, i.e., for suitable parameters the interface
potential exhibits a periodic spatial modulation and AB interfaces adopt a
well-defined distance. We explore for which oscillation periods and amplitudes
an interface repulsion occurs and demonstrate that we can control the preferred
interface distance over a wide range by varying the oscillation period. Using
particle-based simulations we explicitly demonstrate that this dissipative
assembly of a homopolymer blend results in a lamellar structure with multiple
planar interfaces in a thin film geometry.
