PTMSP-ZIF composite membranes were prepared by the addition of zeolitic imidazolate framework (ZIF-8) into poly (1-trimethylsilyl-1-propyne) (PTMSP) having high gas permeability to improve trade-off relationship of the polymer membrane. PTMSP-ZIF composite membranes were prepared with different amounts of ZIF-8; 0, 5, 10, 20, 30 and 40 wt%. Gas permeation properties for H2, N2, CO2, and CH4 were investigated by increasing the amount of ZIF-8 in the PTMSP. The gas permeability of PTMSP-ZIF composite membranes within 5∼30 wt% of ZIF-8 contents increased as ZIF-8 contents went up and decreased thereafter. The gas permeability for CO2 showed the maximum value of 76080 barrer at 30 wt% of ZIF-8 content and PTMSP-ZIF composite membrane containing 20 wt% of ZIF-8 content had the highest selectivity (CO2/N2) with the value of 8.2. The selectivity (H2/N2) and selectivity (CO2/CH4) were almost the same as PTMSP in the range 10∼40 wt% of the ZIF-8. Overall, PTMSP-ZIF composite membranes resulted in maintained selectivity and increased permeability compared to those of PTMSP membranes.

기체 투과도가 우수한 PTMSP [Poly(1-trimethylsilyl-1-propyne)] 고분자막의 양립현상(trade-off relationship)을 개선하기 위해서 ZIF-8 (zeolitic imidazolate framework)을 첨가하여 PTMSP-ZIF 복합막을 제조하였다. PTMSP-ZIF 복합막은 PTMSP에 ZIF-8의 함량을 0, 5, 10, 20, 30, 40 wt%로 하여 제조하였고, PTMSP-ZIF 복합막의 ZIF-8 함량 변화에 따른 H2, N2, CO2, CH4의 기체투과 특성을 알아보았다. 기체투과 실험에서 ZIF-8의 함량 5∼30 wt%까지는 ZIF 함량이 증가함에 따라 기체투과도는 증가하였고, 그 이후에는 감소하였다. PTMSP-ZIF 30 wt% 복합막에서 CO2의 기체투과도가 76080 barrer로 가장 큰 기체투과도를 보였고, PTMSP-ZIF 20 wt% 복합막에서 선택도(CO2/N2)는 8.2로 가장 높은 값을 보였다. 선택도(H2/N2)와 선택도(CO2/CH4)는 ZIF-8 함량 10∼40 wt% 범위에서 PTMSP 단일막과 거의 비슷한 값을 보였다. 전체적으로 PTMSP-ZIF 복합막들은 PTMSP 단일막보다 선택도는 감소되지 않으면서 투과도는 향상된 결과를 보였다.