METHOD OF FORMING POLYTETRAFLUOROETHYLENE FILM WITH HIGH THERMAL STABILITY

FIELD: chemistry of polymers. ^ SUBSTANCE: invention describes a method for applying thin films made of polytetrafluoroethylene on surface of solid bodies. Method involves formation of film from tetrafluoroethylene vapor directly under pressure 0.1-20 torr by effect of electrons beam with energy 1-1000 keV in working chamber separated from electrons source. The process is carried out at density of electrons flow falling on solid body surface in the range from 30 to 6000 muA/cm2 followed by roasting applied films under vacuum or inert atmosphere without intermediate contact with air at temperatures 250-400°C for 0.5-1 h. Roasting films is carried out at 350°C for 1 h, and the process is carried out preferably at electrons flow density falling on surface of solid body in the range 100-3000 muA/cm2, tetrafluoroethylene vapor pressure in the range 1-10 torr and energy pf electrons beam 10-200 keV. The proposed method provides preparing uniform thin films made polytetrafluoroethylene showing high thermal stability and retaining low values of their dielectric penetrability. Invention can be used in electronic engineering, optics and medicinal equipments. ^ EFFECT: improved applying method. ^ 3 cl, 1 tbl, 9 ex