other closer than a permitted length $\sigma$ so the angle distribution for flexible chain has a threshold around $\pi/3$. Strong confinement: Fig. \[fig:bond-ang-dist\](b) shows how longer segments create nematic orientation as we see only two main angle distribution peaks. The initial peak indicates relatively parallel alignment of a majority of consecutively joined segments and the second peak resembles formation of mainly hexagon or nonagon by longer segments, see SM [@SM_]. For shorter segments we see kind of homogeneous distribution with slightly higher possibility of finding the segments in folded state. The flexible chain does not show any significant changes in different confinement regimes. Experiments [@Lettinga] also confirm the effect of geometrical confinement on the reorientation of colloidal rods.

Conclusion
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We proposed a simple coarse-grained stiff segmented polymer model and we applied only the excluded volume effect as non-bonded interaction between the monomers. Our results represent an entropic competition which depends on the degree of confinement where under strong confinement, we see entropy-driven segregation of the chains. The entropy behaves as a tool in any system which represents structural inhomogeneity to organize itself without consuming external energy. The entropy-driven segregation potentially may find some applications in systems where separation of 