TAILIEUCHUNG - Báo cáo hóa học: " Characteristics of hydrophobicity loss on silicone rubber surface during a dynamic drop test with direct current voltage application"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Characteristics of hydrophobicity loss on silicone rubber surface during a dynamic drop test with direct current voltage application | Seo et al. Nanoscale Research Letters 2012 7 4 http content 7 1 4 o Nanoscale Research Letters a SpringerOpen Journal NANO REVIEW Open Access Characteristics of hydrophobicity loss on silicone rubber surface during a dynamic drop test with direct current voltage application 1 1 1 1 2 Yuya Seo Norihito Oshikawa Takuma Miyake Tatsuya Sakoda and Tomikazu Anjiki Abstract Dynamic drop test for studying the temporal lowering of hydrophobicity on the surface of silicone rubber with direct current voltage application was carried out. In this study we evaluated the influence of the temporal lowering of hydrophobicity under various conductivities and dropping rates for water droplets. As a result it was found that the dropping rate and the conductivity of water droplets greatly influenced the hydrophobicity loss time on the surface of silicone rubber. Introduction The development of insulating materials used in electric-powered apparatuses plays an essential role in a stable power supply. Polymer materials for example have attracted attention in recent years. The use of polymer materials for housings of insulators and arresters has increased. The widely accepted polymer materials for housings are silicone rubber SiR and ethylene vinyl acetate. These polymer materials have some excellent properties such as being lightweight hydrophobicity and antiweatherability 1 . Additionally even if the hydrophobicity initially disappears by external stresses the hydrophobicity recovers because of the migration of low molecular weight SiR in a short time 2-5 . Incidentally electric-powered apparatuses are utilized not only by alternating current AC voltage applications but also by direct current DC voltage applications. The polymer material is made from organic matters therefore the aged deterioration due to electric discharges and acidic products is worrying. Studies on evaluation methods of insulation deterioration of polymer materials are continuously made by .

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