condensation and formation of chromosome territories [@cremer2001; @Lanctot; @bancaud2009; @crowd].

It has been presented that geometrical confinement can induce phase separation [@gelbrev; @Jun15082006]. Despite its simplicity, Flory-Huggins theory (FH) [@Huggins41; @Flory42] needs to be improved to be able to deal with phase behavior of more complex systems of polymer blend where we have monomers with structure, stiffness, and different molecular weights [@phaseJCP; @ACS; @freed2005; @PRISM]. FH theory simply indicates that the mixing is not favorable and in general, a polymer blend is immiscible.

Here, we would like to address the competitive entropic segregation in a mixture of different polymer chains under geometrical constraint using molecular dynamics simulation. Importantly the chains differ in how they are segmented, rather than interactions or total numbers of monomers. We introduce the inhomogeneity to the system by using different stiff segmented chains, Fig. \[fig:seg\_poly\](a), and keeping all the interactions the same between all chains. Segment represents a group of united monomers which behaves as rod-like polymer, Fig. \[fig:seg\_poly\](a). There are some similarities between our polymer chains and some coarse-grained models of main-chain liquid crystal elastomers [@de_gennes], euchromatin and heterochromatin structures inside the nucleus [@Gaspar], and lengthwise condensation mechanism [@marko], besides some theoretical models [@Flory1978; @Kristian2003].

