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Preparation of high-flux polyimide of intrinsic microporosity for oxygen enrichment membrane

Authors： XU hao, Liu lingyu, Liu qingtan, Chu jiachen, LI jianxin, MA xiaohua

Units： State Key Laboratory of Membrane Separation and Membrane Process, School of Material Science and Engineering, Tiangong University, Tianjin 300387，China

KeyWords： Polyimide; Asymmetric membrane; Composite membrane; O2/N2 separation

ClassificationCode：TQ31

year,volume(issue):pagination： 2024,44(3):21-29

Abstract：

A ternary copolyimide 6FPDM was prepared using 2, 4, 6-trimethyl M-phenylenediamine (DAM), 4,4'-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) and pyromellitic anhydride (PMDA) as monomers by one-step high temperature polymerization method. By using non solvent induced phase separation method (NIPs), the completion time of phase separation is controlled by controlling the casting solution composition, coagulation bath temperature, additives and membrane thickness. Then, a PMDS layer is coated on the surface of the membrane to prepare the composite membrane. The oxygen/nitrogen separation performance of the polyimide pristine membrane, asymmetric membrane and composite membrane were tested. By regulating the dope solution and phase inversion conditions (15 wt.% absolute ethanol, 1 wt.% LiNO3, coagulation bath at 45 oC, and casting knife thickness of 100 μm), the resulted membrane displayed best gas permeability after coating. The oxygen flux reached 96.9 GPU, and the O2/N2 selectivity of 4.3, which has shown great potential in membrane-based oxygen enrichment field.

Funds：

国家自然科学基金（22078245， 2237080314）;榆林学院-大连化物所联合基金（2022009）

AuthorIntro：

徐浩（1999-），男，内蒙古兴安盟人，研究生，研究方向为聚合物气体分离膜

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