Effects of He and Ar Heat-Assisted Plasma Treatments on the Adhesion Properties of Polytetrafluoroethylene (PTFE)

Ohkubo, Yuji; Okazaki, Yuki; Shibahara, Masafumi; Nishino, Minoru; Seto, Yosuke; Endo, Kazuhiko; Yamamura, Kazuya

doi:10.3390/polym13234266

Cited by 14 publications

(9 citation statements)

References 35 publications

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“…The adhesion strength between pure PTFE and Al plate using an epoxy adhesive increased from 0.02 to 1.4 N/mm via Ar + acrylic acid plasma treatment under atmospheric pressure [31]. In addition, the adhesion strength between pure PTFE and stainless steel bar using an epoxy adhesive increased from 0.00 to 1.17 N/mm via heat-assisted Ar plasma under atmospheric pressure [32]. The direct adhesion between pure PTFE and different materials without any adhesives was also reported.…”

Section: Introductionmentioning

confidence: 99%

Adhesive-Free Adhesion between Plasma-Treated Glass-Cloth-Containing Polytetrafluoroethylene (GC–PTFE) and Stainless Steel: Comparison between GC–PTFE and Pure PTFE

et al. 2022

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In this study, the effect of plasma treatment on glass-cloth-containing polytetrafluoroethylene (GC–PTFE) was investigated. Previous plasma studies investigated pure PTFE (which does not contain glass cloth) but not GC–PTFE. The effect of Ar + H2O plasma treatment on GC–PTFE was investigated. The Ar + H2O plasma-treated GC–PTFE sheets were thermally compressed to stainless steel (SUS304) foils without using adhesive, and the GC–PTFE/SUS304 adhesion strengths were measured using a 90° peel test. The adhesion strength increased with the increase in the plasma treatment time (0.8 and 1.0 N/mm at 20 s and 300 s, respectively). Thus, strong adhesion between GC–PTFE/SUS304 was achieved without adhesive. This improvement in the adhesion properties of GC–PTFE can be attributed to the generation of oxygen-containing functional groups and the decrease in the surface roughness of the samples. Thereafter, the adhesion properties of GC–PTFE and pure PTFE were compared. Because, unlike pure PTFE, GC–PTFE has no weak boundary layer, GC–PTFE exhibited better adhesion properties than pure PTFE under short plasma treatment times.

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Section: Introductionmentioning

confidence: 99%

Adhesive-Free Adhesion between Plasma-Treated Glass-Cloth-Containing Polytetrafluoroethylene (GC–PTFE) and Stainless Steel: Comparison between GC–PTFE and Pure PTFE

et al. 2022

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“…However, these methods can readily damage PTFE structures and cause environmental pollution. As a dry treatment method, plasma treatment is widely used for the surface modification of PTFE, which can introduce a variety of active functional groups on the surface in a short time [ 28 , 29 , 30 , 31 , 32 , 33 ]. However, the wettability after plasma treatment depends on numerous process parameters, such as the type of discharge, feed gas, working pressure, input power, and treatment time.…”

Section: Introductionmentioning

confidence: 99%

Dyeable Hydrophilic Surface Modification for PTFE Substrates by Surface Fluorination

Kobayashi

Nishimura²,

Kim³

et al. 2023

Membranes

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Polytetrafluoroethylene (PTFE) is the most widely used fluoropolymer that has various functionalities such as heat resistance, chemical resistance, abrasion resistance, and non-adhesiveness. However, PTFE is difficult to dye because of its high water repellency. In this study, the PTFE surface was modified by a combination of gold sputtering and surface fluorination to improve dyeability. X-ray photoelectron spectroscopy indicated that, compared with the untreated sample, the gold-sputtered and acid-washed surface of PTFE had a negligible number of C–F terminals. Furthermore, the intensity of the C–C peak increased drastically. The polar groups (C=O and C–Fx) increased after surface fluorination, which enhanced the electronegativity of the surface according to the zeta potential results. Dyeing tests with methylene blue basic dye showed that the dye staining intensity on the surface of fluorinated PTFE samples was superior to other samples. It is due to the increased surface roughness and the negatively charged surface of fluorinated PTFE samples. The modified PTFE substrates may find broad applicability for dyeing, hydrophilic membrane filters, and other adsorption needs.

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“…Among several methods, the chemical wet method [ 14 , 15 , 16 , 17 , 18 ] and the plasma dry method [ 19 , 20 , 21 , 22 , 23 , 24 , 25 ] have been mainly studied to increase the water permeability of surfaces coated with fluorine-based polymers. The Vankelecom research team showed improved permeability by modifying the surface of the PVDF-coated membrane through crosslinking with para-xylenediamine (XDA) [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

“…The Vankelecom research team showed improved permeability by modifying the surface of the PVDF-coated membrane through crosslinking with para-xylenediamine (XDA) [ 26 ]. The Okubo research team improved the adhesion characteristics of PTFE-coated surfaces through a thermal plasma method using He gas [ 24 ]. The chemical wet method has some disadvantages in that the treatment process is complicated and time-consuming [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Oxyfluorination of PFA-Coated Metal Mesh with Superhydrophobic Properties on the Filtration Performance of SiO2 Microparticles

Kim

Kwak

et al. 2023

Molecules

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Recently, semiconductor wastewater treatment has received much attention due to the emergence of environmental issues. Acid-resistant coatings are essential for metal prefilters used in semiconductor wastewater treatment. Perfluoroalkoxy alkane is mainly used as an acid-resistant coating agent, since PFA has inherent superhydrophobicity, water permeability is lowered. To solve this problem, the surface of the PFA-coated metal mesh was treated via an oxyfluorination method in which an injected mixed gas of fluorine and oxygen reacted with the surface functional groups. Surface analysis, water contact angle measurement, and water permeability tests were performed on the surface-treated PFA-coated mesh. Consequently, the superhydrophobic surface was effectively converted to a hydrophobic surface as the PFA coating layer was surface-modified with C-O-OH functional groups via the oxyfluorination reaction. As a result of using simulation solutions that float silica particles of various sizes, the permeability and particle removal rate of the surface-modified PFA-coated stainless-steel mesh were improved compared to those before surface modification. Therefore, the oxyfluorination treatment used in this study was suitable for improving the filtration performance of SiO2 microparticles in the PFA-coated stainless-steel mesh.

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Effects of He and Ar Heat-Assisted Plasma Treatments on the Adhesion Properties of Polytetrafluoroethylene (PTFE)

Cited by 14 publications

References 35 publications

Adhesive-Free Adhesion between Plasma-Treated Glass-Cloth-Containing Polytetrafluoroethylene (GC–PTFE) and Stainless Steel: Comparison between GC–PTFE and Pure PTFE

Adhesive-Free Adhesion between Plasma-Treated Glass-Cloth-Containing Polytetrafluoroethylene (GC–PTFE) and Stainless Steel: Comparison between GC–PTFE and Pure PTFE

Dyeable Hydrophilic Surface Modification for PTFE Substrates by Surface Fluorination

Effect of Oxyfluorination of PFA-Coated Metal Mesh with Superhydrophobic Properties on the Filtration Performance of SiO2 Microparticles

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