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Surface Activation of Poly(Methyl Methacrylate) with Atmospheric Pressure Ar + H2O Plasma

Physics Department, College of Science and Humanities, Prince Sattam Bin Abdulaziz University, P.O. 173, Al-Kharj 11942, Saudi Arabia
Physics Department, Faculty of Science, Zagazig University, Zagazig 44519, Egypt
Coatings 2019, 9(4), 228;
Received: 7 March 2019 / Revised: 21 March 2019 / Accepted: 27 March 2019 / Published: 30 March 2019
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The atmospheric pressure of Ar + H 2 O plasma jet has been analyzed and its effects on the poly(methyl methacrylate) (PMMA) surface has been investigated. The PMMA surface treatment was performed at a fixed gas flow-rate discharge voltage, while varying the plasma treatment time. The Ar + H 2 O plasma was studied with optical emission spectroscopy (OES). Optimum plasma conditions for PMMA surface treatment were determined from relative intensities of Argon, hydroxyl radical (OH), oxygen (O) I emission spectra. The rotational temperature T rot of Ar + H 2 O plasma was determined from OH emission band. The PMMA surfaces before and after plasma treatment were characterized by contact angle and surface free energy measurements, X-ray photoelectrons spectroscopy (XPS), atomic force microscope (AFM) and UV-spectroscopy. The contact angle decreased and surface free energy increased with plasma treatment time. XPS results revealed the oxygen to carbon ratio (O/C) on plasma-treated PMMA surfaces remarkably increased for short treatment time ≤60 s, beyond which it has weakly dependent on treatment time. The carbon C 1s peak deconvoluted into four components: C–C, C–C=O, C–O–C and O–C=O bonds and their percentage ratio vary in accordance with plasma treatment time. AFM showed the PMMA surface roughness increases with plasma treatment time. UV-visible measurements revealed that plasma treatment has no considerable effect on the transparency of PMMA samples. View Full-Text
Keywords: non-thermal plasma; OES; PMMA; XPS; AFM; surface free energy non-thermal plasma; OES; PMMA; XPS; AFM; surface free energy

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Abdel–Fattah, E. Surface Activation of Poly(Methyl Methacrylate) with Atmospheric Pressure Ar + H2O Plasma. Coatings 2019, 9, 228.

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