Specifically, a PAA with high viscosity (> 81 cP) and high molecular weight (≥ 5.39 Mg/mol) is the prerequisites in forming a defect-free PI membrane via casting of chemically imidized PI solution. It was also found that the rheological behavior and molecular weight of PAA could act as a guideline to screen the suitable membrane synthesis protocol for a particular PI structure. Principally, the molecular weight of polyamic acid (PAA) and its corresponding PI depend strongly on the monomer reactivity, which is dominantly controlled by the steric hindrance of monomers’ substituent instead of their electronic nature. In view of this, this study explores the molecular design of PI polymer and the development of PI/zeolitic imidazolate framework-8 (ZIF-8) nanocomposite membrane aiming to improve the gas separation performance. The application of polyimide (PI) membrane for industrial carbon dioxide (CO2) removal has been restricted by its intrinsic trade-off between permeability and selectivity.
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