Structural and mechanical properties of polymer fibers directly depend on the processing conditions of polymer crystallization. Depending on the processing and thermal conditions polymers exhibit different crystal morphology which determine the properties of the final materials. Since many aspects of polymer crystallization are still not well understood, molecular simulations have become a unique tool to elucidate the molecular mechanisms of a crystallization and isolate of the relative effects of the many competing molecular-scale factors. In this work, we performed the molecular dynamics (MD) simulation of a million particle system of well equilibrated and highly entangled polyethylene (PE) melt at the united-atom (UA) level of representation at various values of temperature, elongation ratio and polydispersity. The morphology and mechanical properties of the resulted semi-crystalline materials were calculated and analyzed. Our results demonstrate that our approach can be used as an alternative towards the generation of semi-crystalline polymer materials.