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Simulation and experiment of gas separation performance
 of fluorinated polyimide
Authors： NING Wenchao1, WANG Qiang1, MA Cheng1, MA Yinping1,WU Xian1, WANG Yanshan2， ZHANG Song2
Units： 1. School of Petrochemical Engineering, Liaoning Shihua University, Fushun 113001, China；
2. Shenghong Refining & Chemical (Lianyungang) Co.,Ltd.,  Lianyungang 222248, China
KeyWords： fluorinated polyimide; gas separation; monomer ratio; molecular simulation; solution-diffusion mechanism

 
ClassificationCode：TQ323.7
year,volume(issue):pagination： 2026, 46(3):120-128

Abstract：

Fluorinated polyimide films are of great significance for high-efficiency and low-energy carbon dioxide capture. In this work, an “experimental + simulation” approach was adopted to investigate the effect of the copolymerization ratio of hexafluorodianhydride (6FDA) and hexafluorodiamine (HFBAPP) on the properties of the membrane material, and its characterization and related performance were studied. The results showed that the di-anhydride-excess FPI-3 exhibited good thermal stability (glass transition temperature up to 262 ℃), tensile properties, and gas permeability, with a CO2 permeation rate of 2.963 0 Barrer, but showed poor separation performance for the CO2/N2 system. The ideally proportioned FPI-1 demonstrated performance lower than that of FPI-3 but better separation performance for the CO2/N2 system, with a selectivity of 16.54. The diamine-excess FPI-2 performed lower than FPI-1 in all aspects. The gas permeation process in the membrane was simulated using MATLAB code, which further validated the excellent gas permeation performance of FPI-3. 

Funds：

辽宁省教育厅基础科研项目(LJ212410148038)； 辽宁省科技厅博士启动项目(2025-BS-0419)

AuthorIntro：
第一作者简介： 宁文超（2001-），女，山西忻州人，硕士研究生，研究方向为含氟聚酰亚胺的制备及气体分离.*通讯作者，E-mail：qwang0124@126.com

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