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Design and synthesis of polyimide gas separation membrane containing
trimethylbenzene structure and its gas separation performance

Authors： MA Chenyu, TANG Ao, DONG Jie, ZHAO Xin, LI Xiuting, XU Qingsong, ZHANG Qinghua

Units： State Key Laboratory of Advanced Fiber Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China

KeyWords： polyimide membrane; free volume; steric hindrance; gas separation

ClassificationCode：TQ051.893

year,volume(issue):pagination： 2025,45(4):86-94

Abstract：

Polyimide gas separation membranes have attracted extensive attention in the gas separation field due to their excellent separation performance, mechanical properties and environmental adaptability. However, current measures to improve the gas permeability of polyimides often lead to significant declines in selectivity and mechanical properties. Therefore, simultaneously enhancing the selectivity and permeability of gas separation membranes is a significant challenge in this field. In this study, copolymerization of diphenylketone tetracarboxylic dianhydride (BTDA) with trimethylbenzene diisocyanate (TTDI) and 4,4′-diphenylmethane diisocyanate (MDI) was conducted. By regulating the copolymerization ratio of TTDI and MDI, a series of polyimide gas separation membranes were prepared. This method avoids the drawbacks of preparing polyimide gas separation membranes by the “one-step method” and the “two-step method”, and introduces the trimethylbenzene structure to regulate the free volume, thereby obtaining gas separation membranes that take into account both good selectivity and permeability. The results showed that when TTDI mole fraction was 80% in the copolymer, the prepared polyimide separation membrane had good thermal performance, with a glass transition temperature of 374.60 ℃. Additionally, this separation membrane exhibited excellent separation performance for O2/N2 and CO2/CH4 systems. Specifically, the CO2 permeability was 8.02 Barrer, and the CO2/CH4 selectivity was 57.28. Moreover, there was no obvious plasticization behavior under gas pressures ranging from 0.3 to 1.2 MPa, and its separation characteristics were superior to commercial products such as P84.

Funds：

国家自然科学基金（52173196）

AuthorIntro：

马臣俣（1999-），男，江苏无锡人，硕士生，主要研究方向为气体分离膜

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