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Synthesis and characterization of bis(phenyl)fluorene-based cardo polyimide membranes for H2/CH4 separation

  • Caili ZhangEmail author
Polymers
  • 22 Downloads

Abstract

Three bis(phenyl)fluorene-based cardo diamine monomers with different side groups (–CF3, –H, and –CH3) were synthesized and used to synthesize three 6FDA-based polyimides (6FDA-FBPF, 6FDA-BPF, and 6FDA-MBPF). The influence of bis(phenyl)fluorene cardo moiety and different side groups on the glass transition temperature (Tg), thermal stabilities, and chain packing of the synthesized polyimides were systematically studied. The gas permeabilities and selectivities of three bis(phenyl)fluorene-based polyimide membranes were studied and correlated with their fractional free volumes and chain packing conditions. As a result, the obtained polyimides showed promising performance for hydrogen separation. Among the three polyimides, 6FDA-FBPF had the highest gas permeabilities which exhibited H2 permeability of 151.12 Barrer and H2/CH4 selectivity of 62.19. The high gas separation performance of 6FDA-FBPF mainly attributed to the ineffective chain packing via the incorporation of bi(phenyl)fluorene cardo moiety and introduction of bulky CF3 side groups into the polyimide backbones that is favorable to formation hourglass-shaped pores.

Notes

Acknowledgements

The author acknowledges the financial support of this work by the Natural Science Foundation of Beijing Municipality (2194071).

Compliance with ethical standards

Conflict of interest

The author declares no competing financial interest.

Supplementary material

10853_2019_3609_MOESM1_ESM.docx (1012 kb)
Characterizations. FTIR and HRMS spectra of bis(phenyl)fluorene-based diamine monomers. ATR-FTIR spectra, DSC curves, optical images, thermal properties, and organic solvents solubility of the synthesized bis(phenyl)fluorene-based polyimides (DOCX 1011 kb)

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.School of Materials Science and Mechanical EngineeringBeijing Technology and Business UniversityBeijingChina

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