In membrane industry, recent developments have shown the combination or replacement of classical glassy polymers with crystalline Metallic Organic Frameworks (MOFs), Zeolite Imidazolate Frameworks (ZIFs) or zeolites provides molecularly controlled permeability and selectivity of membranes. However, the main challenges are to get mechanically stable and homogeneous layers of the membranes. By taking advantage of high permeability observed with the rubbery polymers and to their flexible casting properties, Rubbery Organic Frameworks (ROFs) could be used as alternative as gas separation membrane systems. Therefore, nanometric macro-monomers and core connectors have been used to conceive dense (ROFs) for the preparation of polymeric membranes for selective gas transport. With the above concept, in this project, new polymeric membranes based on supramolecular polymeric structures using covalent bonds, were designed selectively for CO2 separation from light gases like N2, and CH4. Then the resulting polymer membranes were characterized spectrometry by (FTIR,1HNMR), their thermal stability were characterized by (TGA and DSC), and the morphological structure was characterized by (SEM and contact angle). The gas permeability measurements for the tested polymeric membranes showed that the permeability of CO2 is higher than other tested gases (N2 and CH4) for the polymeric membranes.