Abstract
Silicone rubber is a promising insulating material that has been performing well for different insulating and dielectric applications. However, in outdoor applications, environmental stresses cause structural and surface degradations that diminish its insulating properties. This effect of degradation can be reduced with the addition of a suitable filler to the polymer chains. For the investigation of structural changes and hydrophobicity four different systems were fabricated, including neat silicone rubber, a micro composite (with 15% micro-silica filler), and nanocomposites (with 2.5% and 5% nanosilica filler) by subjecting them to various hydrothermal conditions. In general, remarkable results were obtained by the addition of fillers. However, nanocomposites showed the best resistance against the applied stresses. In comparison to neat silicone rubber, the stability of the structure and hydrophobic behavior was better for micro-silica, which was further enhanced in the case of nanocomposites. The inclusion of 5% nanosilica showed the best results before and after applying aging conditions.
Highlights
Introduction published maps and institutional affilThe development of polymeric insulators intrigued the interest of researchers in this field due to the achievement of superior properties, such as light weight, high flashover voltages, resistance to contaminations, and high dielectric strength, as compared to ceramic insulators [1,2]
This study focuses on assessing the change in hydrophobic behavior of RTV Silicone Rubber (SiR) based nano and micro composites under accelerated hydrothermal aging conditions
All of the samples exhibited their best hydrophobicity class before aging, as shown in Figure 9, and loss in hydrophobicity was observed as samples were subjected to the aging stresses
Summary
The Room Temperature Vulcanized (RTV-615) silicone rubber, nanosilica (12 nm), and micro-silica (5 μm) used in this work were acquired from Lanxess AG Chemicals, Leverkusen Germany, Degussa, New Jersey, USA and Wuhan Newreach Chemicals in. A ratio of 10:1 was maintained between the and curator in the samples. The sample preparation was carried using a she with a sonicator. The composition of the prepared samples was 2.5 wt% o wt% of nanosilica and 15 wt% of microsilica. Fumed silica filler was treated with ethanol to increas in the polymer matrix [30]. The temperature of silica fillers was maintaine
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