Rational Matching of Metal-Organic Frameworks and Polymers in Mixed Matrix Membranes for Efficient Propylene/Propane Separation

• Published in: Polymers Vol. 16; no. 17; p. 2545
• Main Authors: Yu, Zijun, Sun, Yuxiu, Zhang, Zhengqing, Geng, Chenxu, Qiao, Zhihua
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 09.09.2024
• Subjects: Addition polymerization; Aqueous solutions; Compatibility; Coordination; Fillers; gas separation; improved compatibility; interface coordination; Interfaces; Membranes; Metal-organic frameworks; metal–organic framework; mixed-matrix membranes; Nanoparticles; Permeability; Phase transitions; Polymers; Propane; Propylene; Separation; Solvents; Beijing China; China; interface coordination; improved compatibility; metal–organic framework; mixed-matrix membranes; gas separation
• ISSN: 2073-4360; 2073-4360
• DOI: 10.3390/polym16172545

The exploitation of high-performance membranes selective for propylene is important for developing energy-efficient propylene/propane (C H /C H ) separation technologies. Although metal-organic frameworks with a molecular sieving property have been considered promising filler materials in mixed-matrix membranes (MMMs), their use in practical applications has been challenging due to a lack of interface compatibility. Herein, we adopted a surface coordination strategy that involved rationally utilizing carboxyl-functionalized PIM-1 (cPIM) and ZIF-8 to prepare a mixed-matrix membrane for efficient propylene/propane separation. The interfacial coordination between the polymer and the MOF improves their compatibility and eliminates the need for additional modification of the MOF, thereby maximizing the inherent screening performance of the MOF filler. Additionally, the utilization of porous PIM-1 guaranteed the high permeability of the MMMs. The obtained MMMs exhibited excellent separation performance. The 30 wt% ZIF-8/cPIM-1 membrane performed the best, exhibiting a high C H permeability of 1023 Barrer with a moderate C H /C H selectivity of 13.97 under 2 bars of pressure. This work presents a method that can feasibly be used for the preparation of defect-free MOF-based MMMs for specific gas separations.