CO₂ Capture Using PIM-1 Hollow Fiber Sorbents with Enhanced Performance by PEI Infusion

This paper describes hollow fiber sorbents made of the parent polymer intrinsic microporosity, PIM-1, using a spinning method designed to control formation dense barrier layers followed by simple post treatment with polyethylenimine (PEI) for further improvement CO2 uptake. The overall process involved solvent-moderated sheath-core variation core/bore flow rates and quench bath temperatures. Dope compositions promote micropore interconnectivity were optimized controlling dope nonsolvent concentration. Under conditions, undesirable skin not formed, avoiding associated mass transfer resistance. resulting PIM-1 achieved good uptake, maximum equilibrium capacities 2.8 mmol-CO2/g-fiber. sorption kinetics dependent on PEI loading, allowing designer balance between capacity uptake rate, feature unavailable pure PIM sorbent.