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Energies 2017, 10(7), 1054; doi:10.3390/en10071054

RTV Silicone Rubber Degradation Induced by Temperature Cycling

1
School of Electrical Engineering, Wuhan University, Wuhan 430072, China
2
Electric Power Research Institute, State Grid Qinghai Electric Power Company, Xining 810008, China
*
Authors to whom correspondence should be addressed.
Received: 14 June 2017 / Revised: 10 July 2017 / Accepted: 19 July 2017 / Published: 21 July 2017
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Abstract

Room temperature vulcanized (RTV) silicone rubber is extensively used in power system due to its hydrophobicity and hydrophobicity transfer ability. Temperature has been proven to markedly affect the performance of silicone rubbers. This research investigated the degradation of RTV silicone rubber under temperature cycling treatment. Hydrophobicity and its transfer ability, hardness, functional groups, microscopic appearance, and thermal stability were analyzed using the static contact angle method, a Shore A durometer, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and thermogravimetry (TG), respectively. Some significant conclusions were drawn. After the temperature was cycled between −25 °C and 70 °C, the hydrophobicity changed modestly, but its transfer ability changed remarkably, which may result from the competition between the formation of more channels for the transfer of low molecular weight (LMW) silicone fluid and the reduction of LMW silicone fluid in the bulk. A hardness analysis and FTIR analysis demonstrated that further cross-linking reactions occurred during the treatment. SEM images showed the changes in roughness of the RTV silicone rubber surfaces. TG analysis also demonstrated the degradation of RTV silicone rubber by presenting evidence that the content of organic materials decreased during the temperature cycling treatment. View Full-Text
Keywords: room-temperature vulcanized silicone rubber; temperature cycling; hydrophobicity; transfer of hydrophobicity; hardness; functional group; microscopic appearance; thermal stability room-temperature vulcanized silicone rubber; temperature cycling; hydrophobicity; transfer of hydrophobicity; hardness; functional group; microscopic appearance; thermal stability
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wen, X.; Yuan, X.; Lan, L.; Hao, L.; Wang, Y.; Li, S.; Lu, H.; Bao, Z. RTV Silicone Rubber Degradation Induced by Temperature Cycling. Energies 2017, 10, 1054.

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