Effect of VUV radiation and reactive hydrogen atoms on depletion of fluorine from polytetrafluoroethylene surface

Lojen, Dane; Zaplotnik, Rok; Primc, Gregor; Mozetič, Miran

doi:10.1016/j.apsusc.2020.147356

Cited by 21 publications

(16 citation statements)

References 24 publications

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“…Furthermore, Vegh et al found out that the Ar + ions cause dehydrogenation and crosslinking of the modified layer because of the preferential sputtering of H atoms relative to C atoms [ 8 ]. Recently, Lojen et al reported the influence of the vacuum ultraviolet (VUV) radiation on the surface kinetics of fluorinated polymers upon plasma treatment [ 9 ]. The recent achievements in the field of plasma–polymer interaction [ 8 , 9 ] enable a detailed explanation of results reported by Duca et al in their pioneer paper [ 6 ].…”

Section: Modification Of Pvdf Surface By Exposure To Argon Plasmamentioning

confidence: 99%

“…Recently, Lojen et al reported the influence of the vacuum ultraviolet (VUV) radiation on the surface kinetics of fluorinated polymers upon plasma treatment [ 9 ]. The recent achievements in the field of plasma–polymer interaction [ 8 , 9 ] enable a detailed explanation of results reported by Duca et al in their pioneer paper [ 6 ]. Upon exposure of PVDF to plasma sustained in high-purity argon by capacitively coupled RF discharge, the PVDF material is subjected to both energetic Ar + ions and VUV radiation.…”

Section: Modification Of Pvdf Surface By Exposure To Argon Plasmamentioning

confidence: 99%

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Non-Equilibrium Plasma Methods for Tailoring Surface Properties of Polyvinylidene Fluoride: Review and Challenges

et al. 2021

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Modification and functionalization of polymer surface properties is desired in numerous applications, and a standard technique is a treatment with non-equilibrium gaseous plasma. Fluorinated polymers exhibit specific properties and are regarded as difficult to functionalize with polar functional groups. Plasma methods for functionalization of polyvinylidene fluoride (PVDF) are reviewed and different mechanisms involved in the surface modification are presented and explained by the interaction of various reactive species and far ultraviolet radiation. Most authors used argon plasma but reported various results. The discrepancy between the reported results is explained by peculiarities of the experimental systems and illustrated by three mechanisms. More versatile reaction mechanisms were reported by authors who used oxygen plasma for surface modification of PVDF, while plasma sustained in other gases was rarely used. The results reported by various authors are analyzed, and correlations are drawn where feasible. The processing parameters reported by different authors were the gas pressure and purity, the discharge configuration and power, while the surface finish was predominantly determined by X-ray photoelectron spectroscopy (XPS) and static water contact angle (WCA). A reasonably good correlation was found between the surface wettability as probed by WCA and the oxygen concentration as probed by XPS, but there is hardly any correlation between the discharge parameters and the wettability.

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Section: Modification Of Pvdf Surface By Exposure To Argon Plasmamentioning

confidence: 99%

Section: Modification Of Pvdf Surface By Exposure To Argon Plasmamentioning

confidence: 99%

Non-Equilibrium Plasma Methods for Tailoring Surface Properties of Polyvinylidene Fluoride: Review and Challenges

et al. 2021

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“…Hydrogen was introduced into the plasma reactor after achieving the ultimate pressure. Plasma was sustained in hydrogen for 1 s at the pressure of 35 Pa and forward RF power of 600 W. Such a short plasma treatment was used because the hydrogen plasma treatment causes depletion of fluorine from the surface film [27]. OES was used for basic plasma characterization during the polymer treatment with hydrogen plasma.…”

Section: Resultsmentioning

confidence: 99%

Rapid Functionalization of Polytetrafluorethylene (PTFE) Surfaces with Nitrogen Functional Groups

et al. 2021

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The biocompatibility of body implants made from polytetrafluoroethylene (PTFE) is inadequate; therefore, the surface should be grafted with biocompatible molecules. Because PTFE is an inert polymer, the adhesion of the biocompatible film may not be appropriate. Therefore, the PFTE surface should be modified to enable better adhesion, preferably by functionalization with amino groups. A two-step process for functionalization of PTFE surface is described. The first step employs inductively coupled hydrogen plasma in the H-mode and the second ammonia plasma. The evolution of functional groups upon treatment with ammonia plasma in different modes is presented. The surface is saturated with nitrogen groups within a second if ammonia plasma is sustained in the H-mode at the pressure of 35 Pa and forward power of 200 W. The nitrogen-rich surface film persists for several seconds, while prolonged treatment causes etching. The etching is suppressed but not eliminated using pulsed ammonia plasma at 35 Pa and 200 W. Ammonia plasma in the E-mode at the same pressure, but forward power of 25 W, causes more gradual functionalization and etching was not observed even at prolonged treatments up to 100 s. Detailed investigation of the XPS spectra enabled revealing the surface kinetics for all three cases.

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“…However, its hydrophobic surface restricting the application in water treatment fields because the pores are not permeable to water. Several surface modification methods have been developed to address this problem, such as sodium-naphthalene treatment 16 high energy ray activation, 17 low temperature plasma-treatment. 18,19 Among these methods, the last one is the most promising strategy for the modification of water treatment ePTFE membranes because it has scarcely no damage to the microstructure of the membrane.…”

Section: Introductionmentioning

confidence: 99%

Self-cleaning expanded polytetrafluoroethylene-based hybrid membrane for water filtration

et al. 2022

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Effect of VUV radiation and reactive hydrogen atoms on depletion of fluorine from polytetrafluoroethylene surface

Cited by 21 publications

References 24 publications

Non-Equilibrium Plasma Methods for Tailoring Surface Properties of Polyvinylidene Fluoride: Review and Challenges

Non-Equilibrium Plasma Methods for Tailoring Surface Properties of Polyvinylidene Fluoride: Review and Challenges

Rapid Functionalization of Polytetrafluorethylene (PTFE) Surfaces with Nitrogen Functional Groups

Self-cleaning expanded polytetrafluoroethylene-based hybrid membrane for water filtration

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