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Article

Defluorination of Polytetrafluoroethylene Surface by Hydrogen Plasma

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Department of Surface Engineering, Jozef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia
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Jozef Stefan International Postgraduate School, Jamova cesta 39, 1000 Ljubljana, Slovenia
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Faculty of Natural Sciences and Engineering, University of Ljubljana, Aškerčeva cesta 12, 1000 Ljubljana, Slovenia
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Faculty of Mechanical Engineering, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia
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Institute of Chemistry and Technology of Biobased Systems, Graz University of Technology, Rechbauerstraße 12, 8010 Graz, Austria
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Author to whom correspondence should be addressed.
Polymers 2020, 12(12), 2855; https://doi.org/10.3390/polym12122855
Received: 6 November 2020 / Revised: 25 November 2020 / Accepted: 27 November 2020 / Published: 29 November 2020
(This article belongs to the Special Issue Advances in Plasma Processes for Polymers)
Defluorination of polytetrafluoroethylene (PTFE) surface film is a suitable technique for tailoring its surface properties. The influence of discharge parameters on the surface chemistry was investigated systematically using radio-frequency inductively coupled H2 plasma sustained in the E- and H-modes at various powers, pressures and treatment times. The surface finish was probed by X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS). The measurements of water contact angles (WCA) showed increased wettability of the pristine PTFE; however, they did not reveal remarkable modification in the surface chemistry of the samples treated at various discharge parameters. By contrast, the combination of XPS and ToF-SIMS, however, revealed important differences in the surface chemistry between the E- and H-modes. A well-expressed minimum in the fluorine to carbon ratio F/C as low as 0.2 was observed at the treatment time as short as 1 s when plasma was in the H-mode. More gradual surface chemistry was observed when plasma was in the E-mode, and the minimal achievable F/C ratio was about 0.6. The results were explained by the synergistic effects of hydrogen atoms and vacuum ultraviolet radiation. View Full-Text
Keywords: polytetrafluoroethylene; fluorine depletion; hydrogen plasma; VUV radiation; surface modification; hydrophilic polytetrafluoroethylene; fluorine depletion; hydrogen plasma; VUV radiation; surface modification; hydrophilic
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MDPI and ACS Style

Vesel, A.; Lojen, D.; Zaplotnik, R.; Primc, G.; Mozetič, M.; Ekar, J.; Kovač, J.; Gorjanc, M.; Kurečič, M.; Stana-Kleinschek, K. Defluorination of Polytetrafluoroethylene Surface by Hydrogen Plasma. Polymers 2020, 12, 2855. https://doi.org/10.3390/polym12122855

AMA Style

Vesel A, Lojen D, Zaplotnik R, Primc G, Mozetič M, Ekar J, Kovač J, Gorjanc M, Kurečič M, Stana-Kleinschek K. Defluorination of Polytetrafluoroethylene Surface by Hydrogen Plasma. Polymers. 2020; 12(12):2855. https://doi.org/10.3390/polym12122855

Chicago/Turabian Style

Vesel, Alenka, Dane Lojen, Rok Zaplotnik, Gregor Primc, Miran Mozetič, Jernej Ekar, Janez Kovač, Marija Gorjanc, Manja Kurečič, and Karin Stana-Kleinschek. 2020. "Defluorination of Polytetrafluoroethylene Surface by Hydrogen Plasma" Polymers 12, no. 12: 2855. https://doi.org/10.3390/polym12122855

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