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<p>This study presents the design and fabrication of high-performance polyoxadiazole (POD) membrane materials via a multicarboxylic acid copolymerization strategy, systematically elucidating the structure-property relationships.Using polyphosphoric acid as the solvent medium, gradient polycondensation was carried out with dihydrazide terephthalate and varying ratios of cyclopentanetetracarboxylic acid (CPTA), ethylenediaminetetraacetic acid (EDTA), and ethylene glycol bis(2-aminoethyl ether) tetraacetic acid (EGTA). By tuning the steric effects of the tetracarboxylic acids monomers, the polymer chains underwent a structural transformation from two-dimensional linear arrangements to three-dimensional cross-linked networks. Comprehensive characterization, including FT-IR spectroscopy, thermogravimetric analysis (TGA), and scanning electron microscopy (SEM), was employed to investigate the chemical structure, thermal stability, and membrane morphology. The modified POD membranes demonstrated enhanced oxidation resistance, water absorption control, and superior mechanical properties. Notably, the E-POD<sub>2</sub> sample achieved a maximum tensile strength of 151.64&#xa0;MPa, highlighting its strong potential for advanced membrane applications. Among them, E-POD<sub>2</sub> demonstrated the best overall performance in terms of mechanical strength, oxidation resistance, and water absorption control.</p> Graphical Abstract <p></p>

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Investigation of polyoxadiazole membranes modified with tetracarboxylic acids

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Yijing Huang,
  • Lihong Li,
  • Wenzhuo Hou,
  • Mengqing Yang,
  • Wenlian Xie,
  • Zhiqiang Zhu

摘要

This study presents the design and fabrication of high-performance polyoxadiazole (POD) membrane materials via a multicarboxylic acid copolymerization strategy, systematically elucidating the structure-property relationships.Using polyphosphoric acid as the solvent medium, gradient polycondensation was carried out with dihydrazide terephthalate and varying ratios of cyclopentanetetracarboxylic acid (CPTA), ethylenediaminetetraacetic acid (EDTA), and ethylene glycol bis(2-aminoethyl ether) tetraacetic acid (EGTA). By tuning the steric effects of the tetracarboxylic acids monomers, the polymer chains underwent a structural transformation from two-dimensional linear arrangements to three-dimensional cross-linked networks. Comprehensive characterization, including FT-IR spectroscopy, thermogravimetric analysis (TGA), and scanning electron microscopy (SEM), was employed to investigate the chemical structure, thermal stability, and membrane morphology. The modified POD membranes demonstrated enhanced oxidation resistance, water absorption control, and superior mechanical properties. Notably, the E-POD2 sample achieved a maximum tensile strength of 151.64 MPa, highlighting its strong potential for advanced membrane applications. Among them, E-POD2 demonstrated the best overall performance in terms of mechanical strength, oxidation resistance, and water absorption control.

Graphical Abstract