Synthesis, Characterization, and Gas Separation Properties of Polyimides Incorporating Fluorinated Non-coplanar Triphenylamine Units 


Vol. 26,  No. 12, pp. 5307-5320, Dec.  2025
10.1007/s12221-025-01190-x


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  Abstract

A series of fluorinated copolyimides containing non-coplanar triphenylamine (TPA) units was synthesized from 4,4′-diamino-3′′,5′′-difluorotriphenylamine (DMTPA), 4,4′-oxydianiline (ODA), and 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) through high-temperature polycondensation. The resulting copolyimides exhibited high thermal stability, good solubility in common organic solvents, optical transparency, and enhanced hydrophobicity. Wide-angle X-ray diffraction (WAXD) and molecular simulations confirmed that the bulky fluorinated TPA units increased interchain spacing and fractional free volume (FFV), thereby facilitating gas transport. Gas permeation measurements at 35 °C and 4 bar revealed that CO2 permeability increased with TPA content, whereas CO2/N2 selectivity remained nearly constant (~ 21). The best-performing membrane (DFPI-5) achieved a CO2 permeability of 24.93 Barrer with a CO2/N2 selectivity of 21.31, approaching the 2008 Robeson upper bound. These findings underscore the effectiveness of fluorinated, non-coplanar TPA moieties in tailoring polyimide membranes for advanced gas separation.

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  Cite this article

[IEEE Style]

C. Shan, J. Mo, S. Wu, J. Qu, C. Liu, X. Sun, X. Huang, "Synthesis, Characterization, and Gas Separation Properties of Polyimides Incorporating Fluorinated Non-coplanar Triphenylamine Units," Fibers and Polymers, vol. 26, no. 12, pp. 5307-5320, 2025. DOI: 10.1007/s12221-025-01190-x.

[ACM Style]

Chao Shan, Junhao Mo, Shanshan Wu, Junjie Qu, Chanjuan Liu, Xiaoyi Sun, and Xiaohua Huang. 2025. Synthesis, Characterization, and Gas Separation Properties of Polyimides Incorporating Fluorinated Non-coplanar Triphenylamine Units. Fibers and Polymers, 26, 12, (2025), 5307-5320. DOI: 10.1007/s12221-025-01190-x.

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