Abstract
Surface modification of metathesis-based polynorbornenes (PNB) has been performed by means of direct fluorination. The treatment has been conducted in a flow type reactor in perfluorodecalin medium by fluorination mixture (4.9 vol % F2 + N2) for 30, 60, 120, and 240 min. Virgin and treated PNB films have been investigated by X-ray diffraction, IR spectroscopy, scanning electron microscopy (SEM), and X-ray energy dispersive spectroscopy (XEDS). The surface fluorination of PNB has been shown not to change location of broad reflexes on X-ray powder diffraction patterns and the samples retain amorphous nature. SEM and XEDS have demonstrated laminate structure of treated films and have shown gradual increase of the thickness of the fluorinated layers up to 6–7 µm according to both second electron contrast and concentration profile of fluorine. However, a slight decrease of thickness for the film fluorinated for 240 min has been observed that can be explained by its partial dissolution in the perfluorinated medium. IR spectroscopy has shown (i) an increase of concentration of fluorine- and oxygen-containing groups in the surface layers with increase of fluorination time and (ii) the fluorination is predominantly realized via hydrogen atoms at cis-C=C bonds of norbornene chain. The study of the gas transport and gas separation properties of surface-fluorinated PNB films has shown that the greatest modification effect is manifested for PNB films fluorinated for 30 min, while a further increase in the processing time (up to 240 min) does not lead to an improvement in the effective coefficients of permeability and separation selectivities. Similar patterns have been observed when studying the separation of model gas mixtures (He + CH4 and CO2 + CH4) for surface modified PNB films. At the same time, the separation factors increased from 13 to 47 for a He–CH4 mixture and from 12 to 23 for a CO2–CH4 mixture.
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ACKNOWLEDGMENTS
X-ray diffraction and ATR-IR measurements were carried out at the Center for Collective Use “Analytical Center for Deep Refining of Oil and Petrochemistry” of the Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences.
Funding
This work was supported by the Russian Science Foundation (project no. 18-19-00258).
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Belov, N.A., Nikiforov, R.Y., Alentiev, A.Y. et al. Gas Transport and Separation Properties of Polynorbornene Treated with Elemental Fluorine in a Perfluorodecalin Liquid. Membr. Membr. Technol. 3, 351–364 (2021). https://doi.org/10.1134/S2517751621060020
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DOI: https://doi.org/10.1134/S2517751621060020