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Sulfonated polyimides containing pyridine groups as proton exchange membrane materials

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Abstract

A series of sulfonated polyimides (SPIs) containing pyridine groups were prepared by direct polycondensation from 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTDA), 4,4′-diaminodiphenyl ether-2,2′-disulfonic acid (ODADS) and 4-(4-methoxy)phenyl-2,6-bis(4-aminophenyl)pyridine (DAM). The resulting copolymers displayed good solubility in common organic solvents. Flexible, transparent, tough membranes were obtained via solution casting. All the films showed high thermal stability with desulfonation temperature over 300°C. They exhibited prominent mechanical properties with Young’s modulus around 2.0 GPa. High proton conductivity (0.23 S/cm at 100% RH) was also observed. More importantly, the new materials exhibited low water uptake (30 wt%–75 wt% at 80°C) and improved water stability, which were attributed to the acid-base interaction between sulfonic acid and pyridine functional groups.

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Authors and Affiliations

  1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China

    Rui Lei, Chuan-qing Kang, Yun-jie Huang, Xue-peng Qiu, Xiang-ling Ji, Wei Xing & Lian-xun Gao

  2. Graduate School of the Chinese Academy of Sciences, Beijing, 100049, China

    Rui Lei, Chuan-qing Kang & Yun-jie Huang

Authors
  1. Rui Lei
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  2. Chuan-qing Kang
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  3. Yun-jie Huang
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  4. Xue-peng Qiu
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  5. Xiang-ling Ji
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  6. Wei Xing
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  7. Lian-xun Gao
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Corresponding author

Correspondence to Lian-xun Gao.

Additional information

This work was financially supported by the Department of Science and Technology of Jilin Province (No. 20086019) and the 863 Project from the Ministry of Science and Technology of China (No. 2006AA03Z224).

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Lei, R., Kang, Cq., Huang, Yj. et al. Sulfonated polyimides containing pyridine groups as proton exchange membrane materials. Chin J Polym Sci 29, 532–539 (2011). https://doi.org/10.1007/s10118-011-1063-5

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  • DOI: https://doi.org/10.1007/s10118-011-1063-5

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