본 연구에서는 poly(ether-block-amide) (PEBAX)/poly(ethylene) glycoldiacrylate (PEGDA)/zeolitic imidazolate framework-8 (ZIF-8)-polyethersulfone (PES) 복합막을 제조하여 N2와 CO2의 기체투과 성질을 조사하였다. 각 분자량별 PEGDA 함량 증가에 따른 PEBAX/PEGDA-PES 복합막의 기체 투과도는 감소하였고, CO2/N2 선택도는 거의 일정한 값을 보 이다가 PEGDA 30 wt% 이후 점차 증가하였다. 특히 PEGDA250 g/mol 50 wt%가 첨가되어 제조된 PEBAX/PEGDA250 g/mol 50 wt%-PES의 경우 15.1의 선택도를 보였다. 그리고 각 분자량별로 CO2/N2 선택도가 거의 일정한 범위인 PEGDA 0~30 wt%의 복합막에 대해 ZIF-8에 따른 기체투과 성질을 조사하였다. 대체적으로 첨가되는 ZIF-8 함량이 증가할수록 N2와 CO2의 투과도가 점차 증가하였고, CO2/N2 선택도는 PEBAX/PEGDA250 g/mol 30 wt%/ZIF-8 20 wt%-PES 복합막에서 3.4 로 가장 높았다.
In this study, poly (ether-block-amide) (PEBAX)/poly (ethylene) glycoldiacrylate (PEGDA)/zeolitic imidazolate framework-8 (ZIF-8)-polyethersulfone (PES) composite membranes were prepared. The gas permeation properties of N2 and CO2 were investigated for each composite membrane. First, the gas permeability in the PEBAX/PEGDA-PES composite membrane decreased with increasing PEGDA content for each molecular weight at PEGDA250, PEGDA575, and PEGDA- 700 g/mol. The CO2/N2 selectivity showed a constant value and gradually increased with increasing PEGDA content after 30 wt% PEGDA, and PEBAX/PEGDA250 50 wt%-PES prepared by adding PEGDA250 g/mol 50 wt% showed a selectivity of 15.1. This is because as the PEGDA content increases, the number of diacrylate groups increases, and the CO2 affinity due to the ether structure of PEGDA increases. Gas permeation properties according to ZIF-8 were investigated for composite membranes of PEGDA 0 to 30 wt%, with CO2/N2 selectivity almost constant for each molecular weight. The permeability of N2 and CO2 gradually increased with increasing ZIF-8 content, and CO2/N2 selectivity was the highest at 3.4 in PEBAX/ PEGDA250 g/mol 30 wt%/ZIF-8 20 wt%-PES composite membrane.