Gas Permeation Characteristics of PEBAX-PEI Composite Membranes Containing ZIF-8 Modified with Amine

In this study, poly(ether-block-amide) (PEBAX)/zeolitic imidazolate framework-8 (ZIF-8)-polyetherimide (PEI), and PEBAX/ amine-modified ZIF-8 (amineZIF-8)-PEI composite membranes were prepared by varying the contents of ZIF-8 and amineZIF-8. Also the gas permeability properties of N-2 and CO2 were investigated for each composite membrane. The N-2 and CO2 permeability of the PEBAX/ZIF-8-PEI composite membrane increased as the ZIF-8 content increased, while the CO2/N-2 selectivity gradually decreased. In the case of the PEBAX/amineZIF-8-PEI composite membrane, the permeability of N-2 decreased slightly, and CO2 increased till amineZIF-8 amount was 0.5 wt% and then decreased when the content increased further. The CO2/N-2 selectivity was the highest with a value of 78.3 at 0.5 wt% of amineZIF-8. because the amine modification in the amineZIF-8 improves the compatibility between PEBAX and amineZIF-8, It seems that amineZIF-8 was evenly dispersed in PEBAX, which could be greatly influenced by the porousity of ZIF-8 and also the affinity of amine toward CO2.