  We study structural properties of a ring polymeric melt confined in a film in
comparison to a linear counterpart using molecular dynamics simulations. Local
structure orderings of ring and linear polymers in the vicinity of the surface
are similar to each other because the length scale of surface-monomer excluded
volume interaction is smaller than the size of an ideal blob of the ring. In a
long length scale, while the Silberberg hypothesis can be used to provide a
physical origin of confined linear polymer results, it no longer holds for a
ring polymer case. We also present different structural properties of ring and
linear polymers in a melt, including the size of polymers, an adsorbed amount,
and the coordination number of a polymer. Our observation reveals that a
confined ring in a melt adopts highly segregated conformation due to a
topological excluded volume repulsion, which may provide a new perspective to
understand the nature of biological processes, such as territorial segregation
of chromosomes in eukaryotic nuclei.
