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Design and synthesis of high performance O2/N2 separation membranes based on novel polyimide

Authors： YU daomin,Li kaihua,DONG hao,Li qixuan,JI wenhui,SONG jun, MA xiaohua

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

KeyWords： polyimides; oxygen fluent air; membrane separation; anisotropic membrane; composite membrane

ClassificationCode：TQ31

year,volume(issue):pagination： 2021,41(6):67-74

Abstract：

A novel polyimide was synthesized from 9,9’-fluorene-4,4’-diamine, pyromellitic dianhydride and 4,4'-(hexafluoroisopropylidene)diphthalic anhydride by a one-pot high temperature method. The resulting polyimide (6FDA/PMDA-FDA) was confirmed by 1H NMR and FT-IR. This PI showed good solubility, and thermal stability. The anisotropic membrane was obtained by non-solvent induced phase separation (NIPS) method, and the thickness of the skin layer was controlled by the evaporation time of the casting solvent before dip into water. The anisotropic membrane was thereafter coated with a thin layer of PDMS, the thickness of the active layer, composite layer and the distribution of the silicon were analyzed by SEM/EDX. The resulting membrane of M3 exhibited an O2 flux of 25 GPU and O2/N2 selectivity of 5.3. Additionally, the flux of O2 for C3 is 17.8 GPU and the O2/N2 selectivity reaches as much as 7, indicating a good potential for O2 enrichment from air.

Funds：

国家自然科学基金（22078245），教育部创新团队项目（IRT17R80），天津市科技计划项目（18PTZWHZ00210，19PTSYJC0030）。

AuthorIntro：

于道明（1996-），男，辽宁大连人，研究生。E-mail：ydmchungha@163.com。

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