Direct fluorination of acetyl and ethyl celluloses in perfluorinated liquid medium

Белов, Н. А.; Blinov, I. A.; Alentiev, A. Yu.; Belokhvostov, Vasilii M.; Mukhortov, D. A.; Чирков, С. В.; Mazur, Anton S.; Kostina, Yulia V.; Vozniuk, Olesia N.; Kurapova, E. S.; Yampolskii, Yurii P.

doi:10.1007/s10965-020-02261-8

Cited by 5 publications

(2 citation statements)

References 27 publications

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“…Here, the almost inert liquid phase (a perfluorinated organic liquid) withdraws the reaction heat and should potentially allow the reaction to be performed under mild conditions. This method has been tested previously on conventional polymers (polyphenyleneoxide [ 5 ], substituted celluloses [ 6 ], polystyrene [ 7 ] and polynorbornene [ 8 ]). It was demonstrated that the temperature and fluorine concentration in the fluorinated mixture with helium did not significantly affect the consumption of fluorine, and resulted in surface layers with low fluorine content.…”

Section: Introductionmentioning

confidence: 99%

Hydrophobic–Hydrophilic Properties and Characterization of PIM-1 Films Treated by Elemental Fluorine in Liquid Perfluorodecalin

et al. 2022

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A direct fluorination technique was applied for the surface treatment of PIM-1 films in a liquid phase (perfluorodecalin). The fluorinated samples were analyzed by various instrumental techniques. ATR-IR spectroscopy showed that the fluorination predominantly takes place in methylene- and methyl-groups. Cyano-groups, aromatic hydrogens and the aromatic structure of the PIM-1 repeat unit were shown to be relatively stable at the fluorination conditions. XPS confirmed that the concentration of fluorine, as well as oxygen, in the near surface layer (~1 nm) increases with fluorination time. C1s and O1s surface spectra of the fluorinated PIM-1 samples indicated an appearance of newly-formed C-F and C-O functional groups. Scanning electron microscopy and X-ray energy-dispersive spectroscopy of the fluorinated PIM-1 samples showed an increase of the fluorine concentration at the surface (~0.1–1 μm) with the treatment duration. Analysis of the slices of the PIM-1 films demonstrated a decline of the fluorine content within several microns of the film depth. The decline increased with the fluorination time. A model of fluorine concentration dependence on the film depth and treatment duration was suggested. A change in the specific free surface energy as a result of PIM-1 fluorination was revealed. The fluorination time was shown to affect the surface energy (γSV), providing its shift from a low value (25 mJ∙m−2), corresponding to tetrafluoroethylene, up to a relatively high value, corresponding to a hydrophilic surface.

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Section: Introductionmentioning

confidence: 99%

Hydrophobic–Hydrophilic Properties and Characterization of PIM-1 Films Treated by Elemental Fluorine in Liquid Perfluorodecalin

et al. 2022

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“…Fluorination of polymers in a perfluorinated liquid medium, such as perfluorodecalin (PFD), is a promising method to obtain fluorinated polymers [28][29][30] due to the high chemical resistance of perfluorocarbons and the solubility of gases in them. It was shown in [28] that surface fluorination is accompanied by the dissolution of a fluorinated polymer in PFD, which means that providing a high interface for liquid-phase fluorination in PFD significantly affects the rate of the process.…”

Section: Introductionmentioning

confidence: 99%

Dispersion of Polyethylene Glycol in Perfluorodecalin for Liquid Phase Fluorination

Andreev

Белов

Makarova

et al. 2022

Eurasian Chem.-Technol. J.

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This work aims to obtain the dispersions based on polyethylene glycols (PEGs) of various molecular masses (MM) and perfluorodecalin (PFD) for subsequent direct fluorination. The solubility of the components was estimated using laser interferometry and differential scanning calorimetry, and it was shown that PEGs with different MM are not highly compatible with PFD. The dispersions were prepared during sonication. Gel permeation chromatography (GPC) analysis indicated that MMs almost did not change in this process. While the sonication of PEG-PFD, there is a formation of dispersion with the particle sizes distribution in a range of 0.4‒2 μm depending on the MM of PEG. The dispersion is metastable for several hours, even though its stability was significantly affected by additional bubbling with the gas flow. Moreover, the dispersions with a solid PEG phase (MM > 600 Da) were subjected to a smaller change compared to a liquid one (MM < 600 Da). The results of this research shed light on the applicability of the ultrasonic preparation of PEGs in PFD for liquid-phase fluorination with obtaining perfluorinated polyether of target MM.

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From the Understanding of Fluorination Process to Hydrophobic Natural Fibers

Téraube

Agopian

Pouzet

et al. 2021

Composites Science and Technology

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Direct fluorination of acetyl and ethyl celluloses in perfluorinated liquid medium

Cited by 5 publications

References 27 publications

Hydrophobic–Hydrophilic Properties and Characterization of PIM-1 Films Treated by Elemental Fluorine in Liquid Perfluorodecalin

Hydrophobic–Hydrophilic Properties and Characterization of PIM-1 Films Treated by Elemental Fluorine in Liquid Perfluorodecalin

Dispersion of Polyethylene Glycol in Perfluorodecalin for Liquid Phase Fluorination

From the Understanding of Fluorination Process to Hydrophobic Natural Fibers

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