Abstract
In this study, a high-performance CO2 separation membrane was fabricated by compounding amine-based additives with composite polymers composed of polyvinyl alcohol (PVA) and water-absorbing agents. First, the separation performances of several different membranes were compared; through this process, it was found that the performance was improved when sodium polyacrylate (PAANa) was added to the membrane-forming solution. The physical properties of the membranes and their constituent materials, such as water absorbency and heat tolerance, were also evaluated. The membrane prepared by compounding amine-based additives with a composite polymer produced from PVA and PAANa demonstrated the best performance. When the membrane prepared by compounding amine-based additives with the composite polymer was used to separate a CO2–He mixture (80:20 (v/v)), the CO2/He selectivity of the membrane exceeded 600 at a total pressure of 0.1 MPa and was approximately 200 at a total pressure of 0.7 MPa at 85 °C.
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