Resistance to corona discharge of HTV silicone rubber surface layers fluorinated at different temperatures

An, Zhenlian; Gu, Xiaoqiong; Shen, Ruochen; Tang, Yujiao; Zheng, Feihu; Zhang, Yewen; Yang, Long

doi:10.1109/tdei.2018.006992

Cited by 13 publications

(4 citation statements)

References 48 publications

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“…Information about the wetting mode is relevant for superhydrophobization of polymer surfaces due to the complex effect of increasing the content of fluorine in the surface layer and surface morphology features that can be created by directional etching [41] or by introducing fillers into a polymer [34]. Such surfaces were obtained by oxygen-free fluorination of silicone rubbers (θ a(H2O) = 143.7 • ) [42,105,106] and carbon fiber, which is a component of a composite material based on polyvinylidene fluoride (θ a(H2O) = 153 • ) [34]. Particular attention should be paid to the effect of "sticky superhydrophobicity" of polybutylene terephthalate fiber mats as a result of liquid-phase fluorination [32]: when a drop of water is not separated from the surface by gravity even in the case of non-wetting surface (θ a(H2O) = 156 • ).…”

Section: Changes In the Hydrophilicity/hydrophobicity Of The Polymer Surface As A Results Of Fluorinationmentioning

confidence: 99%

“…Recent studies have shown the effectiveness of direct fluorination in modulating the dielectric properties like conductivity, permittivity, breakdown and flashover voltage of the surface layers of such large-scale produced insulating polymers as polypropylene [162], PE [55,147,149,[158][159][160]165], PS [166], polyimide [48,49,167], epoxy resins [51,150,153,154,166], PDMS [42,54,168], oil-impregnated [161][162][163], and polypropylene laminated paper [162].…”

Section: Electrical Properties Of Polymers After Direct Surface Fluorinationmentioning

confidence: 99%

“…It reduces the concentration of defects at the interface [38,39], which leads to improved mechanical properties. Optimization of the wetting ability of polymer surfaces by fluorination is promising for use in offset printing [30,40,41], ensuring the protective properties of polymer materials [29,[42][43][44][45][46], membrane [27,47]; and sorbents [38] performance. Direct fluorination of polymers also results in the formation of deep and shallow charge traps on a surface that improves dielectric [48][49][50][51], piezoelectric [52,53] properties, surface conductivity [54,55], breakdown [48,56], and DC flashover [57][58][59][60][61][62] voltages.…”

Section: Introductionmentioning

confidence: 99%

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Direct Fluorination as Method of Improvement of Operational Properties of Polymeric Materials

et al. 2020

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Direct fluorination of polymers is a widely utilized technique for chemical modification. Such introduction of fluorine into the chemical structure of polymeric materials leads to laminates with highly fluorinated surface layer. The physicochemical properties of this layer are similar to those of perfluorinated polymers that differ by a unique combination of chemical resistance, weak adhesion, low cohesion, and permittivity, often barrier properties, etc. Surface modification by elemental fluorine allows one to avoid laborious synthesis of perfluoropolymers and impart such properties to industrial polymeric materials. The current review is devoted to a detailed consideration of wetting by water, energy characteristics of surfaces, adhesion, mechanical and electrical properties of the polymers, and composites after the direct fluorination.

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Section: Changes In the Hydrophilicity/hydrophobicity Of The Polymer Surface As A Results Of Fluorinationmentioning

confidence: 99%

Section: Electrical Properties Of Polymers After Direct Surface Fluorinationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Direct Fluorination as Method of Improvement of Operational Properties of Polymeric Materials

et al. 2020

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“…Its most extensive commercial application is to enhance the barrier properties of polymeric containers to permeation of various liquids [13]. However, to the best of our knowledge, there are no reports on the application of direct fluorination for the improvement of moisture barrier properties of polymers, although the method has been used to improve the electrical properties of polymer insulators in the past decade [14][15][16]. For example, we have reported that direct fluorination can improve the hydrophobicity and discharge resistance of a HTV SIR material and fluorination conditions have an effect on the property improvement [15,16].…”

Section: Introductionmentioning

confidence: 99%

Moisture Barrier Properties of Silicone Rubber Surface Layers Fluorinated at Different Temperatures

Chen

Huang

et al. 2021

IEEE Trans. Dielect. Electr. Insul.

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In this study, direct fluorination is used to modify the surface of silicone rubber. Moisture barrier properties of the SIR surface layers fluorinated at different temperatures are evaluated by moisture absorption experiments at a temperature of 30 or 60 °C and at a relative humidity of 75 or 97%. Physicochemical characteristics of the fluorinated SIR surface layers are investigated on the basis of ATR-IR, XPS and SEM techniques. The moisture absorption measurements show that the fluorinated surface layer has a distinct moisture barrier to the entry of water into the interior of SIR at each humidity and temperature condition, and a close association of the barrier properties with fluorination temperature or physicochemical characteristics of the fluorinated layer. The barrier is particularly significant for such a surface layer fluorinated at a lower temperature, which has higher fluorine content and compactness although a small thickness, compared to the surface layer fluorinated at higher temperatures. In addition, fitting analysis of the experimental data further shows a lower apparent diffusivity of the surface fluorinated samples than the unfluorinated sample.

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Improved flashover performance and tracking resistance of silicone rubber by direct fluorination

Shen

Gao

et al. 2019

J of Applied Polymer Sci

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Silicone rubber (SIR) samples are fluorinated using a F2/N2 mixture at different temperatures. Physicochemical characteristics are analyzed by attenuated total reflection infrared spectroscopy, X‐ray photoelectron spectroscopy, and scanning electron microscopy. Basic properties of the fluorinated surface layers are investigated, and the intrinsic alternating current (AC) flashover performance and tracking resistance of the surface fluorinated samples are evaluated. The flashover test results indicate that the fluorination leads to an improvement in AC flashover performance of the SIR material, as a result of the competition between the favorable effect of the increase in surface conduction and the adverse effect of a likely increase in surface layer permittivity. The increase in AC flashover voltage is associated with the voltage‐increasing mode of the flashover test. The flashover test results also show an improved tracking resistance of the SIR material by the fluorination, and the improvement is especially significant for the fluorinated surface layer that has less cleavage of SiC bonds or a good compactness as well as a large thickness. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48556.

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Resistance to corona discharge of HTV silicone rubber surface layers fluorinated at different temperatures

Cited by 13 publications

References 48 publications

Direct Fluorination as Method of Improvement of Operational Properties of Polymeric Materials

Direct Fluorination as Method of Improvement of Operational Properties of Polymeric Materials

Moisture Barrier Properties of Silicone Rubber Surface Layers Fluorinated at Different Temperatures

Improved flashover performance and tracking resistance of silicone rubber by direct fluorination

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