Abstract
Heat-assisted plasma (HAP) treatment using He gas is known to improve the adhesive-bonding and adhesive-free adhesion properties of polytetrafluoroethylene (PTFE). In this study, we investigated the effects of He and Ar gaseous species on the HAP-treated PTFE surface. Epoxy (EP) adhesive-coated stainless steel (SUS304) and isobutylene–isoprene rubber (IIR) were used as adherents for the evaluation of the adhesive-bonding and adhesive-free adhesion properties of PTFE. In the case of adhesive bonding, the PTFE/EP-adhesive/SUS304 adhesion strength of the Ar-HAP-treated PTFE was the same as that of the He-HAP-treated PTFE. In the case of adhesive-free adhesion, the PTFE/IIR adhesion strength of the Ar-HAP-treated PTFE was seven times lower than that of the He-HAP-treated PTFE. The relation among gaseous species used in HAP treatment, adhesion properties, peroxy radical density ratio, surface chemical composition, surface modification depth, surface morphology, surface hardness, and the effect of irradiation with vacuum ultraviolet (VUV) and UV photons were investigated. The different adhesive-free adhesion properties obtained by the two treatments resulted from the changes in surface chemical composition, especially the ratios of oxygen-containing functional groups and C–C crosslinks.
Highlights
Polytetrafluoroethylene (PTFE) is a typical fluoropolymer consisting of only CF2 chains
In adhesive-free adhesion, the adhesion strength of Ar-heat-assisted plasma (HAP)-treated PTFE/isobutylene–isoprene rubber (IIR) was much lower than that of He-HAP-treated PTFE/IIR. The replacement from He to Ar gas in HAP treatment is possible in adhesive bonding, but the replacement is impossible in adhesive-free adhesion
The two treatment methods led to differences in the peroxy radical density ratio, surface chemical composition, surface hardness, and surface morphology of PTFE
Summary
Polytetrafluoroethylene (PTFE) is a typical fluoropolymer consisting of only CF2 chains It exhibits high sliding properties, high hydrophobic and oleophobic properties, high electric insulation, high ultraviolet (UV) resistance, and high heat resistance. It is applicable under severe environments even though other polymers are unavailable for the situation because of a shortage of some properties. We compared the effects of Ar-HAP treatment with those of He-HAP treatment on the adhesion property, peroxy radical density, surface chemical composition, surface modification depth, surface morphology, and the surface hardness of PTFE
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