Therefore, an alternative method without using sodium-containing solutions has been long needed. In addition, sodium residues remain on PTFE.

However, the solutions have a bad smell and dramatically impact on humans and the environment. Therefore, corrosive materials such as sodium–naphthalene and sodium–ammonium complex solutions have been used to improve its adhesion property to other materials 3, 4. Of all resins, polytetrafluoroethylene (PTFE) is the most difficult to adhere. They are, however, difficult to adhere to other types of materials because of their low surface energy 1, 2. These results indicated that heating during plasma treatment promotes the etching of the weak boundary layer (WBL) of PTFE, resulting in a sharp increase in the adhesion property of PTFE.įluoropolymers have several excellent properties such as high hydrophobicity, high oleophobicity, high chemical resistance, high antifouling property, high sliding property, high thermal resistance, high weather resistance, low relative permittivity, and low dielectric loss tangent. The surfaces of the plasma-treated PTFE with or without heating were investigated by the measurements of electron spin resonance, X-ray photoelectron spectroscopy, nanoindentation, scanning electron microscopy, and scanning probe microscopy. Cohesion failure of IIR occurred during the T-peel test because of its extremely high adhesion property. The adhesion strengths of Low-P and Low-P+Heater were 0.12 and 2.3 N/mm, respectively. Thermal compression of the plasma-treated PTFE with or without heating and isobutylene−isoprene rubber (IIR) was performed, and the adhesion strength of the IIR/PTFE assembly was measured via the T-peel test. In contrast, when plasma-treated at 8.3 W/cm 2 while using the heater (Low-P+Heater), the surface temperature of Low-P+Heater was controlled to about 260 ☌. When plasma-treated at 8.3 W/cm 2 without using the heater (Low-P), the surface temperature of Low-P was about 95 ☌. For this purpose, a PTFE sheet was plasma-treated at atmospheric pressure while heating using a halogen heater. The heating effect on the adhesion property of plasma-treated polytetrafluoroethylene (PTFE) was examined.

Pdms si2p xps peak