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Preparation copolymerized polyimide thermal rearrangement modified membrane and its CO2/CH4 separation performance

Authors： ZOU Yonglan, JIA Hongge, XU Rui, ZHAO Shijun, ZHOU Junkang

Units： 1.College of Chemistry and Chemical Engineering; 2.College of Materials Science and Engineering, Qiqihar University, Qiqihar 161000, China

KeyWords： silanization; copolymerization; polyimide; thermal rearrangement; gas separation membrane

ClassificationCode：TQ11-2357

year,volume(issue):pagination： 2023,43(3):87-93

Abstract：

Diamine 2, 2-bis (3-amino-4-hydroxy-phenyl) hexafluoropropane (APAF) was silanized and then copolymerized with 4, 4-diaminodiphenyl ether in three molar ratios of 7:3, 5:5, 3:7 and anhydride 4,4 '-(hexafluoroisopropene) diphthalic acid. After chemical imiination, high molecular weight copolyimide membranes with good solubility was obtained. After heat treatment at 350 ℃-400 ℃, different degrees of thermally rearranged modified membranes were obtained. FT-IR spectra proved that copolyimide and thermally rearranged modified membranes were successfully prepared. The results showed that the selectivity of CO2/CH4 increased with the increase of APAF content of silanized polyimide. As the temperature of thermal rearrangement increases, the permeability coefficient of CO2 increases, and the gas selectivity of CO2/CH4 increases. It can be seen that the transformation of oxazole ring enhances the rigidity of the molecular chain and thus improves the gas separation performance of the membrane. The permeability coefficient of CO2 in the 400℃ thermal rearrangement (7:3) membrane increased by 8.4 times from 32.82 Barrer to 275.62 Barrer, and the gas separation performance of CO2/CH4 in the membrane after thermally rearranged exceeded the upper bound of Robeson in 2008.

Funds：

黑龙江省重点研发计划指导类项目（GZ20210034），黑龙江省领军人才梯队后备带头人资助项目（黑人社函2019（278）号）

AuthorIntro：

邹永兰（1997-），女，广东省揭阳市人，硕士研究生，主要研究方向：热重排改性聚酰亚胺气体分离膜。E-mail：zouyonglan1997@163.com

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