Mixed‐Matrix Membranes Formed from Multi‐Dimensional Metal–Organic Frameworks for Enhanced Gas Transport and Plasticization Resistance. Issue 11 (29th April 2019)

• Record Type: Journal Article
• Authors: Chi, Won Seok; Sundell, Benjamin J.; Zhang, Ke; Harrigan, Daniel J.; Hayden, Steven C.; Smith, Zachary P.
• Is Part Of: ChemSusChem. Volume 12:Issue 11(2019)
• Page Start: 2355
• Page End: 2360
• Publication Date: 2019-04-29
• Subjects: gas separation -- HKUST-1 -- metal–organic framework -- mixed-matrix membranes -- plasticization; Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.201900623
• Languages: English
• ISSNs: 1864-5631

Abstract

Abstract: Mixed‐matrix membranes (MMMs) formed by incorporating metal–organic frameworks (MOFs) into polymers have a general limitation in that the MOFs are typically formed into rather simple dimensionalities (such as 1D, 2D, or 3D). Each design approach has intrinsic—albeit independent—benefits, such as network percolation (1D), access to high‐aspect ratios (2D), and ease of processability (3D). However, a design strategy is needed to combine multiple dimensionalities and, thereby, access the full range of transport and compositing benefits of these high‐performance materials. Herein, a facile method to form multi‐dimensional HKUST‐1 nanoparticles is introduced by using a modulator to tune the MOF nucleation and growth mechanism. At 30 wt % multidimensional MOF loading, the MMM shows CO2 permeabilities of approximately 2500 Barrer, which represents a 2.5‐fold increase compared to that of a pure polymer without a large loss of selectivity for CO2 /CH4 and CO2 /N2 . Additionally, almost no plasticization pressure response is observed for CO2 up to 750 psi, suggesting an unusual stability to high activity feeds. Abstract : Exploring new dimensions for MOFs : Metal–organic frameworks (MOFs) with interconnected rod‐like branches were formed by modifying traditional MOF synthesis conditions. These multi‐dimensional MOFs were dispersed in polymers forming mixed‐matrix membranes (MMMs), thereby creating gas transport percolation pathways at low MOF loadings. Incorporation of multi‐dimensional MOFs also endows MMMs with a strong resistance to plasticization.