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Preparation of sulfonated intrinsic microporous polyimide and the effect of sulfonation degree on their gas separation properties

Authors： 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： sulfonated polyimide; gas separation membrane; separation of CO2/CH4; high selectivity;

ClassificationCode：TQ31

year,volume(issue):pagination： 2023,43(3):1-7

Abstract：

In this study, a series of novel sulfonated polyimides is prepared by one-pot high temperature polymerization method. Different from the post-sulfonation method, the degree of sulfonation (DS) can be precisely regulated by varying the ratio of 2, 4, 6-trimethyl- diaminobenzenesulfonic acid (TrMSA) and 2, 4, 6-trimethyl-m-phenylenediamine (DAM). The sulfonation degree is controlled to be 25%, 50%, 75% and 100%. And the effect of DS on the gas separation performance was deeply investigated. The physical properties such as chemical structure, chain packing and thermal properties are systematically studied using FT-IR, XRD, TGA, BET, respectively. The results show that as the increment of -SO3H groups, the chain spacing decreases from 0.57, 0.52, 0.47 to 0.42 nm, due to the strong hydrogen bonding interaction of SO3H group. Consequently, the permeability of gases decreases with the increase of DS, while the selectivity of CO2/CH4 gradually increases from 30.8 to 75.4. Particularly, the sulfonated polyimide with DS of 75% displayed a high CO2/CH4 selectivity of 47.8 and remained barely unchanged when the pressure increased from 2 to 20 bar. In a word, our work provides a deep insight for preparation of novel sulfonated polyimides with high gas separation performance.

Funds：

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

AuthorIntro：

刘清潭（1997-），女，陕西西安人，硕士研究生，E-mail：liuqt1221@163.com

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