Improving mixed-matrix membrane performance via PMMA grafting from functionalized NH2–UiO-66

摘要: The major obstacles in gas separation by mixed-matrix membranes (MMMs) are poor dispersion and affinity between polymers fillers. present study demonstrates that these challenges can be overcome appropriately utilizing a series of synthesized stand-alone MMMs. matrix used was polymethyl methacrylate (PMMA) the MMMs were situ polymerization methyl (MMA) presence UiO-66, NH2–UiO-66 vinyl group attached UiO-66. In MMA UiO-66 resulted PMMA grafted with high degree grafting. Microscopic analysis field emission scanning electron microscopy (FESEM) revealed desirable nanoscale suitable distribution across membrane thickness as well strong interface achieved using functionalized amino groups particular permeability pure He, CO2, N2, CH4 gases determined constant volume/variable pressure method at 25 °C 4 bar. results demonstrated aforementioned ideal selectivity He/CH4, He/N2, CO2/N2, CO2/CH4 increased increasing amount MOF loading. Particularly, containing (g-MMM) exhibited highest for He/CH4 He/N2 best permeation helium gas, which remarkably well-positioned on Robeson's upper bound curves. g-MMM could promising candidate practical separation.