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Materials 2018, 11(2), 311; https://doi.org/10.3390/ma11020311

Comparison of SF6 and CF4 Plasma Treatment for Surface Hydrophobization of PET Polymer

1
Jozef Stefan International Postgraduate School, Jamova 39, Ljubljana 1000, Slovenia
2
Jozef Stefan Institute, Jamova 39, Ljubljana 1000, Slovenia
*
Author to whom correspondence should be addressed.
Received: 20 January 2018 / Revised: 13 February 2018 / Accepted: 18 February 2018 / Published: 21 February 2018
(This article belongs to the Special Issue Surface Modification to Improve Properties of Materials)
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Abstract

The fluorination of the polymer polyethylene terephthalate in plasma created from SF6 or CF4 gas at various pressures was investigated. The surface was analysed by X-ray photoelectron spectroscopy and water contact angle measurements, whereas the plasma was characterized by optical emission spectroscopy. The extent of the polymer surface fluorination was dependent on the pressure. Up to a threshold pressure, the amount of fluorine on the polymer surface and the surface hydrophobicity were similar, which was explained by the full dissociation of the SF6 and CF4 gases, leading to high concentrations of fluorine radicals in the plasma and thus causing the saturation of the polymer surface with fluorine functional groups. Above the threshold pressure, the amount of fluorine on the polymer surface significantly decreased, whereas the oxygen concentration increased, leading to the formation of the hydrophilic surface. This effect, which was more pronounced for the SF6 plasma, was explained by the electronegativity of both gases. View Full-Text
Keywords: sulphur hexafluoride (SF6) plasma; tetrafluoromethane (CF4) plasma; polymer polyethylene terephthalate (PET); surface modification; functionalization and wettability; optical emission spectroscopy (OES); electronegativity sulphur hexafluoride (SF6) plasma; tetrafluoromethane (CF4) plasma; polymer polyethylene terephthalate (PET); surface modification; functionalization and wettability; optical emission spectroscopy (OES); electronegativity
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Resnik, M.; Zaplotnik, R.; Mozetic, M.; Vesel, A. Comparison of SF6 and CF4 Plasma Treatment for Surface Hydrophobization of PET Polymer. Materials 2018, 11, 311.

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