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

Abstract

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.

Preparation Optimization of CFRP and EPDM Composite by the Co-Curing Method

“…The specimen size tested was 200 mm × 5 mm × 4 mm. For the 90° peel strength test, CFRP was fixed on a sliding rig using screws, and EPDM rubber was peeled from the substrate with a crosshead speed of 10 mm/min and an angle of 90° [ 31 , 32 ]. Every three specimens were determined for one group.…”

Direct adhesion between Cu foil and polytetrafluoroethylene without increasing surface roughness for high-frequency printed wiring boards

“… 18 In addition, open-air type Ar + H 2 O plasma treatment and thermal compression achieved an adhesion strength of ≥0.8 N mm −1 between stainless steel (SUS304) and pure-PTFE or GC-PTFE. 6 Ar + acrylic acid plasma jet treatment increased the adhesion strength between the electroless-plated Cu and pure-PTFE from 0.02 to 0.92 N mm −1 . 19 Furthermore, the adhesion strength between the electroless-plated Cu and plasma-treated perfluorinated ethylene propylene (FEP) was ∼1 N mm −1 without increasing the interface roughness.…”

“…In contrast, the GC-PTFE surface does not contain a WBL because its manufacturing does not involve cutting. 6 Therefore, the GC-PTFE does not require any additional process to eliminate the WBL, and its adhesion property can be improved within a short period of surface treatment. 6 Furthermore, compared to pure-PTFE, the GC-PTFE exhibits a low coefficient of linear thermal expansion (CTE) and high thermal stability because the GC-PTFE contains a glass cloth.…”

“… 6 Therefore, the GC-PTFE does not require any additional process to eliminate the WBL, and its adhesion property can be improved within a short period of surface treatment. 6 Furthermore, compared to pure-PTFE, the GC-PTFE exhibits a low coefficient of linear thermal expansion (CTE) and high thermal stability because the GC-PTFE contains a glass cloth. However, depending on the manufacturing conditions, GC-PTFE often exhibits waviness generated by the glass cloth inside its surface.…”

The Effect of Electroless Nickel–Polytetrafluoroethylene Coating on the Frictional Properties of Orthodontic Wires

“…Attempts have been made to coat PTFE on temporary crowns and dental prosthetics, etc., and, as a result, PTFE has demonstrated excellent impact absorption, high wear resistance, and ease of cleaning. However, PTFE also has low surface energy and does not adhere easily to metallic materials [11]. Therefore, baking at 400 • C is required to obtain strong adhesion between PTFE and metals.…”