Abstract
H2S plasma created by an electrode-less radio-frequency discharge was used to modify the surface properties of the polymer polyethylene terephthalate. X-ray photoelectron spectroscopy, secondary ion mass spectrometry and atomic force microscopy were used to determine the evolution of the surface functionalities and morphology. A very thin film of chemically bonded sulfur formed on the surface within the first 10 s of treatment, whereas treatment for more than 20 s caused deposition of higher quantities of unbonded sulfur. The sulfur concentration reached a maximum of between 40 and 80 s of plasma treatment; at longer treatment times, the unbonded sulfur vanished, indicating instability of the deposited sulfur layer. Large differences in the surface morphology were observed.
Highlights
Plasma created in various gases are often used for altering the surface properties of polymer materials
SO2 plasma could be useful for polymer modification in biomedical applications, e.g., preparation of antithrombogenic surfaces or for altering cell adhesion
PET polymer was modified with radicals created in the gaseous plasma of H2 S
Summary
Plasma created in various gases are often used for altering the surface properties of polymer materials. Oxygen and nitrogen-containing plasmas (O2 , CO2 , N2 , NH3 ) or their mixtures with noble gases, such as He and Ar, are commonly used for surface hydrophilization [1,2,3,4,5]. A few papers have reported on tailoring the surface properties by SO2 plasma [8,9,10]. SO2 plasma could be useful for polymer modification in biomedical applications, e.g., preparation of antithrombogenic surfaces or for altering cell adhesion. There are almost no reports in the scientific literature regarding the use of other sulfur-containing plasmas, such as H2 S, for polymer modification
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