Mixed-matrix membranes (MMMs) containing thermally and chemically stable hybrid metal-organic materials and thermally stable polymers present a promising composite for gas separations at high pressures and high temperatures (i.e., H2 from CO2 in water-gas shift reactions and N2 from CO2 in coal plants in the generation of electricity). In this study, the effect of linker functionalization on additive dispersion and gas separation was investigated. Nanoparticles of the MOFs amino-MIL-53 and MIL-53 (20 wt%) as well as soluble MOP-18 (alkyl functionalized MOP-1, up to 80 wt%) crystals were incorporated into thermally stable polyimides. Compared to pure VTEC�, the presence of the amino functional group in the MOF increased both the selectivity and permeability of the membrane for H2/CO2 from 5.3 (H2 = 3.89 Barrers) to 9.4 (H2 = 12.2 Barrers), whereas the non-functionalized MOF-based MMM increased permeability only (H2 = 13.2 Barrers). Alkylation of the MOP-18 linker allowed for loadings of up to 80 wt% and improved dispersion, while retaining the mechanical stability of the membrane. Permeability data of MOP-18/Matrimid� MMMs tested with CO2 at 70 �C and 50 atm showed that plasticization of the MMM was minimal and that the plasticization pressure increased from 9 atm at 35 �C to 23 atm at 70 �C.

Effect of functionalization of metal organic framework (MOF) and metal organic polyhedra (MOP) materials in polyimides for gas separations at high pressure and high temperature

247th National Meeting (2014)

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