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

Belov, N.A.; Alentiev, A.Y.; Pashkevich, D.S.; Voroshilov, F.A.; Dvilis, E.S.; Nikiforov, R.Y.; Chirkov, S.V.; Syrtsova, D.A.; Kostina, J.V.; Ponomarev, I.I.; Asanov, I.P.; Bogdanova, Y.G.

Авторы: Belov Nikolay A., Alentiev Aleksandr Yu, Pashkevich Dmitrii S., Voroshilov Fedor A., Dvilis Edgar S., Nikiforov Roman Yu, Chirkov Sergey V., Syrtsova Daria A., Kostina Julia V., Ponomarev Igor I., Asanov Igor P., Bogdanova Yulia G.
Журнал: Polymers
Том: 14
Номер: 23
Год издания: 2022
Издательство: MDPI
Местоположение издательства: Basel, Switzerland
Первая страница: 5152
DOI: 10.3390/polym14235152
Аннотация: A direct fluorination technique was applied for the surface treatment of PIM-1 films ina liquid phase (perfluorodecalin). The fluorinated samples were analyzed by various instrumentaltechniques. ATR-IR spectroscopy showed that the fluorination predominantly takes place inmethylene- and methyl-groups. Cyano-groups, aromatic hydrogens and the aromatic structure of thePIM-1 repeat unit were shown to be relatively stable at the fluorination conditions. XPS confirmedthat the concentration of fluorine, as well as oxygen, in the near surface layer (~1 nm) increaseswith fluorination time. C1s and O1s surface spectra of the fluorinated PIM-1 samples indicated anappearance of newly-formed C-F and C-O functional groups. Scanning electron microscopy andX-ray energy-dispersive spectroscopy of the fluorinated PIM-1 samples showed an increase of thefluorine concentration at the surface (~0.1–1 m) with the treatment duration. Analysis of the slicesof the PIM-1 films demonstrated a decline of the fluorine content within several microns of thefilm depth. The decline increased with the fluorination time. A model of fluorine concentrationdependence on the film depth and treatment duration was suggested. A change in the specific freesurface energy as a result of PIM-1 fluorination was revealed. The fluorination time was shown toaffect the surface energy (SV), providing its shift from a low value (25 mJm􀀀2), corresponding totetrafluoroethylene, up to a relatively high value, corresponding to a hydrophilic surface.
Добавил в систему: Пономарев Игорь Игоревич

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Hydrophobic–Hydrophilic Properties and Characterizationof PIM-1 Films Treated by Elemental Fluorine in Liquid Perfluorodecalinстатья

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