Nuhnen Alexander, Klopotowski Maximilian, Tanh Jeazet Harold B, Sorribas Sara, Zornoza Beatriz, Téllez Carlos, Coronas Joaquín, Janiak Christoph
Institut für Anorganische Chemie und Strukturchemie, Heinrich-Heine-Universität Düsseldorf, 40204 Düsseldorf, Germany.
Dalton Trans. 2020 Feb 11;49(6):1822-1829. doi: 10.1039/c9dt03222c.
Combination of the polyimide 6FDA-mPD (6FDA = 4,4'-hexafluoroisopropylidene diphthalic anhydride and mPD = m-phenylenediamine) and crystallites of the metal-organic frameworks (MOFs) MIL-101(Cr) or MOF-199 (HKUST-1, Cu-BTC) produces mixed-matrix membranes (MMMs) with excellent dispersion and compatibility of the MOF particles within the polymer matrix. Permeation tests of a binary CO2/CH4 (50/50) gas mixture showed a remarkable increase of CO2 permeabilities for MIL-101(Cr)@6FDA-mPD and significantly higher selectivities for MOF-199@6FDA-mPD. The CO2 permeability increased from 10 (neat polymer) to 50 Barrer for the 24 wt% MIL-101(Cr)@6FDA-mPD membrane (with essentially constant selectivity) due to the high pore volume of MIL-101(Cr). The CO2/CH4 selectivity increased from 54 to 89 from the neat 6FDA-mPD polymer to the 24 wt% MOF-199@6FDA-mPD membrane, apparently due to the high CO2 adsorption capacity of MOF-199.
聚酰亚胺6FDA-mPD（6FDA = 4,4'-六氟异丙基二邻苯二甲酸酐，mPD = 间苯二胺）与金属有机框架（MOF）MIL-101（Cr）或MOF-199（HKUST-1，Cu-BTC）的微晶相结合，可制备出混合基质膜（MMM），其中MOF颗粒在聚合物基质中具有出色的分散性和相容性。对二元CO₂/CH₄（50/50）气体混合物的渗透测试表明，MIL-101（Cr）@6FDA-mPD的CO₂渗透率显著提高，而MOF-199@6FDA-mPD的选择性则明显更高。由于MIL-101（Cr）的高孔容，对于24 wt%的MIL-101（Cr）@6FDA-mPD膜，其CO₂渗透率从10（纯聚合物）提高到50 Barrer（选择性基本保持不变）。从纯6FDA-mPD聚合物到24 wt%的MOF-199@6FDA-mPD膜，CO₂/CH₄选择性从54提高到89，这显然是由于MOF-199的高CO₂吸附容量所致。
