chains and only fluctuates around some average value). Increasing the degree of confinement results in a higher bending energy cost, but by reorganizing the chains, the system tries to minimize this penalty and disentangle the chains. Besides that, the FENE potential prevents overstretched bonds, despite the higher non-bonded repulsive force, to lower the bonded energy. As a result of cooperation between FENE,bond angle potentials, and entropic effect, the segregated phase has the lower energy state (in terms of bonded potential energy contribution). In figure \[fig:energy\_\], we just presented two energy terms, bond angle potential of extra-stiff segments and the FENE potential of flexible bond between the segments, but the behavior of all the other terms are similar and the energy contribution of all bonded potentials are decreased by increasing the degree of confinement (see Supplemental Material (SM)[@SM_] for notes on the pressure in strong confinement regime).

We investigated the effect of curvature of the container by performing simulations with the same chains and interactions in both cuboid container with impenetrable walls and slits with periodic boundary conditions [@aakkmn]. For both cuboid and slit we see a similar segregation of the chains at the same volume fraction as in spherical case, 