Abstract
This paper discusses the state of the art in the application of self-healing silicone-based materials for outdoor high-voltage insulation. Both the dynamic behavior of the dimethyl side groups of silicone rubber and the diffusion of a bulk siloxane to maintain low surface energy are respectively reported as intrinsic mechanisms responsible for the self-healing of silicone rubber. Localization, temporality, mobility, and the type of synthesis are the aspects defining the efficiency of the self-healing ability of silicone rubber. In addition, the deterioration of the self-healing ability with filler loaded into silicone rubber insulation housing composites is discussed. Taking the self-healing property into consideration among the other properties of silicone rubber insulators, such as tracking and erosion resistance, can be a useful design practice at the material development stage. Hydrophobicity retention, recovery, and transfer measurements are discussed as useful indicators of the self-healing ability of silicone rubber. Nevertheless, there remains a need to standardize them as design tests at the material development stage. The paper is intended to shed the light on the hydrophobicity recovery, a key material design parameter in the development of silicone rubber outdoor insulating composites, similar to the tracking and erosion resistance.
Highlights
Self-healing polymers have gained interest for their wide range of applications
Voltage insulation applications, for itsmainly superior electricaltoperformance, in polThis superior performance has been attributed the ability ofparticularly silicone rubber to luted conditions. This superior performance has been mainly attributed to the ability of retain hydrophobicity after wetting, which clearly falls within the definition of a self-healing silicone rubber to retain hydrophobicity after wetting, which clearly falls within the defiability [17]
Self-healing mechanisms of silicone rubber could be intrinsic with dimethyl bonds re-orienting and restoring the hydrophobicity of the surface or an extrinsic mechanism with the diffusion of the LMW siloxane from the bulk to the surface
Summary
Self-healing polymers have gained interest for their wide range of applications. The term “Self-healing” refers to polymers’ extrinsic or intrinsic self-repairing ability to regain their structural or molecular integrity after damage, thereby increasing their life expectancy, durability, and enhancing their performance under different conditions [1]. Voltage insulation applications, for itsmainly superior electricaltoperformance, in polThis superior performance has been attributed the ability ofparticularly silicone rubber to luted conditions. This superior performance has been mainly attributed to the ability of retain hydrophobicity after wetting, which clearly falls within the definition of a self-healing silicone rubber to retain hydrophobicity after wetting, which clearly falls within the defiability [17]. This paper presents the state-of-the-art development and evaluation of self-healing silicone rubber for outdoor high-voltage insulation applications
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