ИСТИНА

It is known that the treatment of polytetrafluoroethylene (PTFE) by low-temperature plasma leads to a decrease in the wetting angle, which is usually explained by an increase of the concentration of oxygen-containing polar groups. When stored in air, an increase of the wetting angle is observed. We experimentally showed that treatment of PTFE films by direct current glow discharge leads to accumulation of electric charges in the surface layer. During storage, the electret potential of PTFE decreases. This suggests that electrical charges significantly affect the wetting of polymer surface through the charge-dipole interaction mechanism.