Deposition of teflon-like protective layers in surface discharge at atmospheric pressure

Abstract

Recently the technologies based on atmospheric pressure plasma sources become very promising tool for the control of surface properties of solids while the desirable bulk properties are kept. In this work the surface barrier discharge operated at atmospheric pressure was used for deposition of thin protective hydrophobic films from mixture of nitrogen with C 4 F 8 on the paper substrate. The plasma parameters were investigated by means of optical emission spectroscopy. Surface properties of the deposited thin films were studied by means of the contact angle measurements. The colorimetric parameters such as whiteness, yellowness or brightness of samples were measured in its deposited state and also in UV exposed states.PACS : 52.77.Dq

Effects of Treatment Time by Sulfur Hexafluoride (SF6) Plasma on Barrier and Mechanical Properties of Paperboard

“…Figure displays SEM images of cellulose fibres of paperboard. The images show that SF 6 plasma treatment had no effect on the surface morphology of paperboard samples; this is because plasma species usually do not penetrate below 10 nm of the surface . However, at a longer treatment time, such as 600 s for this study, cellulose fibres seem to show a rough surface, which is mainly due to plasma etching.…”

“…The images show that SF 6 plasma treatment had no effect on the surface morphology of paperboard samples; this is because plasma species usually do not penetrate below 10 nm of the surface. 28,31,32 However, at a longer treatment time, such as 600 s for this study, cellulose fibres seem to show a rough surface, which is mainly due to plasma etching. Further surface analysis was conducted by XPS to investigate the number of fluorine atoms on the paper surface as a function of treatment time.…”

“…Water resistance, which is a typical characteristic of fluorinated polymers, can be imparted to natural fibres through the application of fluorine‐containing resins, thus creating outstanding water resistance properties. On the other hand, low‐temperature plasma treatments are known to induce physical and chemical surface changes in polymers through etching, grafting, polymerization and/or cross‐linking processes, without changing their bulk properties . Plasma species do not penetrate below about 10 nm of the surface; therefore, the rest of the paperboard's chemical structure remains totally unmodified during the plasma treatment …”

“…On the other hand, low-temperature plasma treatments are known to induce physical and chemical surface changes in polymers through etching, grafting, polymerization and/or cross-linking processes, without changing their bulk properties. [29][30][31][32][33] Plasma species do not penetrate below about 10 nm of the surface; therefore, the rest of the paperboard's chemical structure remains totally unmodified during the plasma treatment. 31,34,35 Because demand for environmentally friendly packaging using renewable resources with high water resistance and oil barrier properties is increasing, further investigation on the effect of plasma technology on biodegradable packaging materials such as paperboard is needed.…”