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A Melamine-Based Polyimide as Filler in P84 Mixed Matrix Membrane for Increasing Permeability in O2/N2 Separation

Xiaoxu Yuan, Quanping Wu, Yue Zhang, Guoxiong Deng, Yilei Wang, Xueping Zong, Song Xue

A Mixed Matrix Membrane (MMM) was developed for improving O2/N2 selectivity by using a polyimide covalent organic framework (PI-COF) as filler. The PI-COF powder was synthesized by heating melamine and 3,3’,4,4’-biphenyl tetracarboxylic dianhydride (BPDA) at 200°C through solvothermal reaction. The structure of PICOF was characterized by FT-IR, SEM, and XRD. Commercial P84 polyimide membrane blended with the PI-COF afforded a larger permeability of N2 than that of O2. At 0.1 MPa, N2 and O2 had the permeability of 466 and 219 barrer, respectively, and the ideal gas selectivity of 2.13 was achieved at the loading 20% PI-COF. Through this mixed matrix membrane prepared from simple synthesis and low cost of the starting materials, it provided an alternative polyimide COF as filler to oxygen-enriched air for commercial uses.