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Effects of temperature and surface roughness on the evaluation of hydrophobic properties of silicone rubber

The surface free energy has negative temperature dependence. Surface roughness of the silicone rubber also affects the hydrophobic condition of the polymer surface. Therefore, in this study, the effects of temperature and surface roughness on the evaluation of degradation condition of silicone rubber are researched. Hydrophobicity of silicone rubber was measured by using a volume change method of a water droplet on the sample surface. Using an image data analysis of the water droplet, dynamic contact angles such as advanced contact angle, θa, and receded contact angle, θr, are automatically evaluated. The effects of temperature and surface roughness to the dynamic contact angles of silicone rubber samples are compared to diagnose the degradation condition of silicone rubber. Comparing of these evaluation results can define the degradation condition of the polymer insulator more accurately than before.