Negative corona charge stability in plasma treated polytetrafluoroethylene teflon films

Chen, Qiang

doi:10.1088/0022-3727/37/5/011

Cited by 14 publications

(14 citation statements)

References 16 publications

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“…For the treated samples, at higher binding energies, two new peaks appear at 293.5 and 294.6 eV; these chemical shifts are usually assigned to a * CF 3 or * COF 2 -and -CF 2 - * CF 3 chemical environments, respectively, [10,11] for the carbon atoms. For lower binding energies, two other peaks related to- * CF-and C- * CF 2 -C [12] are also found. This indicates some chemical alteration of the surface www.interscience.wiley.com/journal/sia probably due to etching and recombination [5,7] without the loss of the stoichiometry.…”

Section: Xps Resultsmentioning

confidence: 89%

How to increase the hydrophobicity of PTFE surfaces using an r.f. atmospheric‐pressure plasma torch

Carbone

Boucher

Sferrazza

et al. 2010

Surface & Interface Analysis

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An experimental investigation of the surface modification of polytetrafluoroethylene (PTFE) by an Ar and Ar/O 2 plasma created with an atmospheric-pressure radio frequency (r.f.) torch is presented here. The surfaces were analyzed by atomic force microscopy (AFM), XPS and water contact angle (WCA) to get an insight of the surface morphology and chemistry. An increase of roughness is observed with the Ar/O 2 plasma treatment. The WCA analysis shows that these surfaces are more hydrophobic than pristine PTFE; a contact angle of 135• was measured. When a PTFE surface is treated by Ar plasma, no roughening or significant change of the surface morphology and chemistry of PTFE was observed. The effects of the Ar and O 2 fluxes on the PTFE surface treatment were analyzed, as well as the effect of the power and treatment time. The plasma phase was also analyzed by optical emission spectroscopy, and some correlations with the treatment efficiency of the plasma are made. The chemistry on the surface is finally discussed and the competition between etching and re-deposition chemical reactions on the surface is proposed as a possible explanation of the results.

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Section: Xps Resultsmentioning

confidence: 89%

How to increase the hydrophobicity of PTFE surfaces using an r.f. atmospheric‐pressure plasma torch

Carbone

Boucher

Sferrazza

et al. 2010

Surface & Interface Analysis

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“…So, at this stage, it can be suspected that a too high density of F atoms may be counterproductive in reducing space charge build-up. It must be stressed that surface oxidation can have positive impact on negative charge stability in case of corona charged fluorinated polymers [66]. So, possibly there is an adequate balance of F grafting and oxidation producing optimum charge injection control.…”

Section: (Oxy-) Fluorinationmentioning

confidence: 99%

Interface tailoring for charge injection control in polyethylene

Teyssèdre

Zhao

et al. 2017

IEEE Trans. Dielect. Electr. Insul.

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The insulating materials used to develop HVDC technologies suffer from a major drawback, which is the accumulation of electrical charges forming internal space charge with possibly two major consequences: (i)-the out-of-control of the internal electric field distribution initiating current runaway and (ii)-cumulated molecular level damages extending or creating defects and leading ultimately to breakdown. To prevent space charge accumulation, one possible route, not examined in depth by the scientific community to date is to control the charge injection at the interfaces between the insulating material and the "electrodes" (metallic or semi-conducting). Different routes were followed in this work for tailoring the interface between electrode and polyethylene material, based on chemical modification of the insulation or layer intercalation. Depending on the process, charge injection control is achieved either for negative charges or for charges of both polarities. The process of charge injection control is discussed with reference to the chemical/physical modifications brought about by the different treatments. The results provide indication towards a strategy to control the injection in power cables and other electrical components.

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“…4,5,25,[34][35][36][37] Other methods such as plasma and chemical treatments are applicable for thin PTFE films in the micrometer thickness range. 32,38 In radiation dosimetry, thick PTFE electret discs (e.g., millimeter) are commonly used due to their better good mechanical stability during charging, handling and also their electrostatic potential measurement. 4,23,24 According to our previous studies, production of a large-area positively charged PTFE electret disc (0.5-mm thickness, 6-cm diameter) by using the modified corona rotating system was unsuccessful (i.e., 41.9% decay of charge over 77 days) based on the pre-or post-charge annealing heat treatment protocol.…”

Section: Effects Of Ptfe Thickness Charge Polarity and Needle-to-ptfmentioning

confidence: 99%

Surface potential uniformity and sensitivity of large-area PTFE electret discs of different thicknesses produced by a modified corona poling rotating system for dosimetry applications

2019

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In this study, large-area (6-cm diameter) Teflon polytetrafluoroethylene (PTFE) discs of different thicknesses (0.2-, 0.5- and 1 -mm) were negatively and positively charged by using the “modified single point-to-plane corona poling rotating system”. The effects of some crucial parameters of the PTFE disc as well as the modified corona poling rotating system on the PTFE surface potential uniformity such as: (a) PTFE disc thickness, (b) PTFE disc polarity and (c) needle-to-PTFE disc distance were successfully reported. Accordingly, closer needle-to-PTFE disc distance, positive charging mode and thinner PTFE disc provided a better PTFE surface potential uniformity. However, the effects of PTFE charge polarity and needle distance on the electrostatic charge potential uniformity were much more remarkable in comparison with the effects of PTFE thickness. Additionally, the surface potential distribution profiles of charged PTFE discs were totally flat and independent of the PTFE thickness at 5- and 13-[Formula: see text]mm needle distances for the negative and positive charging modes, respectively. At the optimized charging conditions, large-area PTFE electret disc (0.5-mm-thick) with positive uniform surface charge potential especially at the edges up to [Formula: see text] 1.8[Formula: see text]kV with stability up to 77 days studied was produced by applying a new multiple heat treatment protocol to the PTFE disc for radon dosimetry. As also observed in this study, the sensitivity of PTFE electret dosimeters to a defined radon gas concentration increases as the PTFE thickness increases. Meanwhile, 0.5-mm-thick PTFE electret disc produced was selected to be used as a high quality electret dosimeter with acceptable and superior parameters for different applications in particular medium-term radiation dosimetry in both low and high dose rate ionizing radiation fields.

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Negative corona charge stability in plasma treated polytetrafluoroethylene teflon films

Cited by 14 publications

References 16 publications

How to increase the hydrophobicity of PTFE surfaces using an r.f. atmospheric‐pressure plasma torch

How to increase the hydrophobicity of PTFE surfaces using an r.f. atmospheric‐pressure plasma torch

Interface tailoring for charge injection control in polyethylene

Surface potential uniformity and sensitivity of large-area PTFE electret discs of different thicknesses produced by a modified corona poling rotating system for dosimetry applications

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