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Preparation and properties of ternary copolyimide proton exchange membranes

Authors： WEI Xinyu, ZHAI Fengxia， WEI Kaijie， ZHAO Shicheng

Units： Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237,China

KeyWords： polyimide; block copolymer; proton exchange membrane

ClassificationCode：TQ028； O63

year,volume(issue):pagination： 2025,45(2):40-47

Abstract：

In order to develop novel proton exchange membranes with high proton conductivity, this paper selected 4,4′-bis(4-aminophenoxy)biphenyl-3,3′-disulfonic acid(BAPBDS),4,4′-bis(4-aminophenoxy)biphenyl (BAPB), and 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTDA) as monomers. By controlling the ratio of sulfonated to non-sulfonated monomers and the polymerization method, random copolymers and block copolymers of polyimide were prepared, and their conductivity, tensile properties, and chemical stability were characterized. The results showed that the conductivity of both random copolymer membranes and block copolymer membranes increased with temperature, reaching 0.089 S/cm and 0.129 S/cm at 80 ℃, respectively. This is due to the phase separation of hydrophilic and hydrophobic domains, which establishes more ion channels that promote proton transfer. However, the random copolymer membrane could withstand immersion in water at 80 ℃ for up to 3 000 hours without rupture, while the block copolymer membrane could only last for 1 500 hours under the same degree of sulfonation. The tensile strength of the two at room temperature were 49 MPa and 14 MPa, respectively, with elongation at break of 29% and 23%, respectively. In summary, although the proton conductivity of random copolymer membranes was lower than that of block copolymer membranes, they exhibited better hydrolytic stability and mechanical properties. The research findings can provide guidance for the design and preparation of high-performance polyimide proton exchange membranes.

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AuthorIntro：

魏馨雨（2001-),女，安徽宣城人，硕士研究生，从事磺化聚酰亚胺复合膜的研究.

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