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<p>In this work, polyethyleneimine (PEI)-functionalized multi-walled carbon nanotubes (PEI@MWCNTs) were synthesized by coating pristine MWCNTs with PEI. Subsequently, mixed matrix membranes (MMMs) containing various loadings of PEI@MWCNTs were fabricated by incorporating the aminated nanotubes into FFBA (a fluorinated copolyimide, synthesized from 6FDA, FPPAB, and BAMF) matrix. This modification strategy takes advantage of the low-diffusion-resistance tubular structure of MWCNTs to facilitate gas transport, while the abundant amino groups of PEI serve as active sites for CO<sub>2</sub> molecules. The PEI@MWCNTs/FFBA MMMs exhibited superior thermal stability compared with the pristine FFBA membrane. X-ray diffraction (XRD) analysis revealed that the incorporation of carbon nanotubes expanded the interchain spacing within the PI matrix, thereby increasing the free volume of the membrane. Gas permeation tests showed that, at a PEI@MWCNTs loading of 3 wt%, the CO<sub>2</sub> permeability increased by 74%, while the CO<sub>2</sub>/N<sub>2</sub> selectivity improved by 46%. These results indicate that the incorporation of PEI@MWCNTs enables simultaneous improvements in both gas permeability and selectivity, thus mitigating the conventional permeability–selectivity trade-off typically observed in polymer membranes. This work offers a novel and effective strategy to enhance interfacial interactions between dispersed nanomaterials and the PI matrix, showing great promise for practical gas separation applications.</p>

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PEI-coated MWCNTs Incorporating Polyimide Membrane for High Efficient Gas Separation

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Chao Shan,
  • Zhongying Liu,
  • Shanshan Wu,
  • Junjie Qu,
  • Junhao Mo,
  • Xiaoyi Sun,
  • Chanjuan Liu,
  • Xiaohua Huang

摘要

In this work, polyethyleneimine (PEI)-functionalized multi-walled carbon nanotubes (PEI@MWCNTs) were synthesized by coating pristine MWCNTs with PEI. Subsequently, mixed matrix membranes (MMMs) containing various loadings of PEI@MWCNTs were fabricated by incorporating the aminated nanotubes into FFBA (a fluorinated copolyimide, synthesized from 6FDA, FPPAB, and BAMF) matrix. This modification strategy takes advantage of the low-diffusion-resistance tubular structure of MWCNTs to facilitate gas transport, while the abundant amino groups of PEI serve as active sites for CO2 molecules. The PEI@MWCNTs/FFBA MMMs exhibited superior thermal stability compared with the pristine FFBA membrane. X-ray diffraction (XRD) analysis revealed that the incorporation of carbon nanotubes expanded the interchain spacing within the PI matrix, thereby increasing the free volume of the membrane. Gas permeation tests showed that, at a PEI@MWCNTs loading of 3 wt%, the CO2 permeability increased by 74%, while the CO2/N2 selectivity improved by 46%. These results indicate that the incorporation of PEI@MWCNTs enables simultaneous improvements in both gas permeability and selectivity, thus mitigating the conventional permeability–selectivity trade-off typically observed in polymer membranes. This work offers a novel and effective strategy to enhance interfacial interactions between dispersed nanomaterials and the PI matrix, showing great promise for practical gas separation applications.