Function Enhancement of Polymer Pipe Internal Wall by RF Plasma

Surface modification of polymer pipes using RF plasma was introducedand the streaming electrification in polymer pipes was investigated for pure water or insulatingliquid. The inner wall surface of low density polyethylene (LDPE) pipe or polytetrafluoroethylene（PTFE） pipe was treated in O - 22 - D2，N - D22 - D2 and CF - D24 - D2 plasma. The salient results are summarized as follows:(1)它是difficult to control the streaming current of water in LDPE pipe by the treatment in O D22 D2 orD22 D2 plasma. The steaming electrification of water in The polymer pipe is mainly subject tothe electrostatic induction by charges on the internal wall surface.(2) the steaming current ofdistilled silicone liquid decreases on about one digit by O D22 D2 or N D22 D2 plasma treatmentbut does not decrease by D24 D2 plasma treatment.(3) by adding a surfactant in the siliconeliquid,the state of a electric double layer between the polymer and the liquid is controlled. the steaming目前的解决方案of a anionic surfactant in the silicone liquid increases by CF D24 D2 plasmatreatment at the about two digits，and increases on about one digit by O - D22 - D2 or N - D22 - D2 plasma treatment.(4) The steaming目前是微不足道的供应商在plasma treatment （DC， DC）(5) It is indicated from these results that the structure of electric doublelayer depends on the gas plasma used the surface treatment

Surface modification of polymer pipes using RF plasma was introduced, and the streaming electrification in polymer pipes was investigated for pure water or insulating liquid. The inner wall surface of low density polyethylene (LDPE) pipe or polytetrafluoroethylene (PTFE) pipe was treated in OィイD22ィエD2, NィイD22ィエD2 and CFィイD24ィエD2 plasma. The salient results are summarized as follows :(1) It is difficult to control the streaming current of water in LDPE pipe by the treatment in OィイD22ィエD2 or NィイD22ィエD2 plasma. The steaming electrification of water in the polymer pipe is mainly subject to the electrostatic induction by charges on the internal wall surface.(2) The steaming current of distilled silicone liquid decreases on about one digit by OィイD22ィエD2 or NィイD22ィエD2 plasma treatment, but does not decrease by CFィイD24ィエD2 plasma treatment.(3) By adding a surfactant in the silicone liquid, the state of a electric double layer between the polymer and the liquid is controlled. The steaming current of solution of a anionic surfactant in the silicone liquid increases by CFィイD24ィエD2 plasma treatment at the about two digits, and increases on about one digit by OィイD22ィエD2 or NィイD22ィエD2 plasma treatment.(4) The steaming current is little dependant on the frequency of plasma treatment (DC, 20kHz and 13.56MHz).(5) It is indicated from these results that the structure of electric double layer depends on the gas plasma used the surface treatment.