Fundamental aspect and behavior of saturated fluorocarbons in glow discharge in absence of potential source of hydrogen

Iriyama, Yu; Yasuda, H.

doi:10.1002/pola.1992.080300826

Cited by 43 publications

(36 citation statements)

References 24 publications

(1 reference statement)

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“…The details of cathodic polymerization were presented previously elsewhere. 13,14 It should be also emphasized that HFE is not a monomer of plasma polymerization in general sense, which does not form polymer in a hydrogen-free environment 15 but forms polymer in presence of hydrogen atoms either provided by the addition of hydrogen gas or from hydrocarbon substrates that contact with plasma. In this particular process of plasma polymerization of HFE on the surface of the plasma polymer of TMS, plasma polymerization of HFE occurred by utilization of hydrogen atoms existing on the surface of the TMS plasma polymer.…”

Section: Adhesion Failure Of the Plasma Polymer Of Tms To Aluminum Almentioning

confidence: 99%

Adhesion of the plasma polymer of trimethylsilane to aluminum alloys

Yasuda

Reddy

et al. 2002

J of Applied Polymer Sci

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ABSTRACT:The adhesion of a plasma polymer and the corrosion protection offered to aluminum alloy substrates depends on the cleanliness of the substrate surface and the state of oxides on the aluminum alloy surface. Both factors are dependent on what type of alloy is used, and consequently, the best preparation of the substrate surface differs on the type of aluminum alloy. Oxygen plasma treatment is effective for the elimination of organic surface contamination, but plasma treatment, such as that of mixed argon and hydrogen, cannot be used to modify the surface state of oxides on these alloys. This is because oxides of aluminum are stable and thus resist plasma modification, and prolonged plasma treatment has been observed to change concentrations of alloy components at the surface due to the heating of the alloy. Chemical cleaning of the surface is necessary before the application of the plasma polymer used for corrosion protection enhancement. Once the surface was properly prepared, a plasma polymer of trimethylsilane (TMS), prepared by cathodic polymerization, adhered well to aluminum alloys investigated in this study. Major adhesive failure, however, occurred as a consequence of reactor contamination when hexafluoroethane (HFE) plasma treatment of initially formed TMS plasma polymers was employed. Plasma pretreatment of the substrate with O 2 or postplasma treatment of the plasma polymer of TMS with Ar (instead of HFE) was effective in eliminating the surface-contamination effect on the adhesion.

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Section: Adhesion Failure Of the Plasma Polymer Of Tms To Aluminum Almentioning

confidence: 99%

Adhesion of the plasma polymer of trimethylsilane to aluminum alloys

Yasuda

Reddy

et al. 2002

J of Applied Polymer Sci

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“…Several fundamental studies on characterization of CF 4 plasma-treated surfaces can be found in literature [13][14][15][16][17][18][19][20][21][22]. The major reactive components in CF 4 plasmas are reported to be F atoms and relatively low concentrations of CF n (n = 1, 2 and 3) radicals [13,15,18].…”

Section: Introductionmentioning

confidence: 99%

Increasing the Hydrophobicity of a PP Film Using a Helium/CF4 DBD Treatment at Atmospheric Pressure

Geyter

Morent

Gengembre

et al. 2008

Plasma Chem Plasma Process

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Plasma surface modification is widely used to tailor the surface properties of polymeric materials. Most treatments are performed using low pressure plasma systems, but recently, atmospheric dielectric barrier discharges (DBDs) have appeared as interesting alternatives. Therefore, in this paper, an atmospheric He + CF 4 DBD is used to increase the hydrophobicity of a polypropylene (PP) film. The surface characterization of the PP film is performed using contact angle measurements, X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). Results show that the hydrophobic properties of the polymer films are greatly enhanced after plasma treatment as evidenced by an increased contact angle. The incorporation of fluorine on the surface is significant (45 at%), demonstrating the ability of the used DBD set-up to generate fluorine-containing functional groups on the PP surface.

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“…C 3 F 8 is at the border. 8,9 The reason perfluorocarbons with higher F/C do not polymerize is that the F atom could be an etching species for hydrocarbon polymers as well as for silicon 10 and depress the polymerization. Therefore, as the number of fluorines decreases, the effectiveness of the polymerization increases.…”

Section: Introductionmentioning

confidence: 98%

“…They are CF 4 and C 2 F 6 , which are well-known as good etching gases for silicon. The classification of polymer forming and non-polymer forming for any perfluorocarbon can be done by its F/C ratio [5][6][7][8] ; ones with lower F/C ratios are polymer forming, and ones with higher F/C ratios, such as CF 4 and C 2 F 6 , are non-polymer forming. C 3 F 8 is at the border.…”

Section: Introductionmentioning

confidence: 99%

Plasma polymerization of fluoromethanes

Iriyama

Noda

1998

J. Polym. Sci. A Polym. Chem.

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Methane and fluoromethanes (CHnF4−n, 1 ≤ n ≤ 3) were subjected to an rf glow discharge plasma. All the fluoromethanes (including methane) polymerized in the plasma and formed thin films. The deposition rate of the fluoromethanes depended on their monomer structure: CH2F2, of which the F/H ratio is unity, showed the greatest deposition rate. The elimination of H and F atoms as H—F was found to be a key factor for the polymerization of fluoromethanes. The chemical composition of the polymerized film, measured with X‐ray photoelectron spectroscopy and glow discharge emission spectroscopy, was also found to be strongly dependent on monomer structure. © 1998 John Wiley & Sons, Inc. J. Polym. Sci. A Polym. Chem. 36: 2043–2050, 1998

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Fundamental aspect and behavior of saturated fluorocarbons in glow discharge in absence of potential source of hydrogen

Cited by 43 publications

References 24 publications

Adhesion of the plasma polymer of trimethylsilane to aluminum alloys

Adhesion of the plasma polymer of trimethylsilane to aluminum alloys

Increasing the Hydrophobicity of a PP Film Using a Helium/CF4 DBD Treatment at Atmospheric Pressure

Plasma polymerization of fluoromethanes

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