In this work, we start with a case study of PIM-PI-8 membranes, focusing on understanding the sensitivity of the values of permeability and perm-selectivity obtained in NE-DCVMD to various parameters of the system. We then explore a series of polymers, specifically PIM-1, PIM-7, PIM-PI-1, PIM-PI-9, PIM-PI-10, PIM-PI-11, 6FDA-TMDA, and generalize the trends observed for permeability and perm-selectivity as a function of strucutral characteristics of the polymers.