Adhesion Improvement Mechanism of Polytetrafluoroethylene by Heat-assisted Atmospheric Pressure Glow Plasma Treatment

The adhesive strength of polytetrafluoroethylene (PTFE) film increased drastically by heat-assisted plasma treatment and PTFE indicated cohesive failure inside the PTFE. By increasing the temperature, defluorination progressed. The PTFE treated with H-2/He had significantly lower adhesive strength than the PTFE treated with only He. The peak assigned to stretching vibration of -CH2- could be observed only in the film treated with H-2/He plasma. From above, we concluded the improvement of the adhesive strength requires the formation of dangling bonds and a crosslinked structure on the PTFE surface.