Electric surface properties of Delrin used for high voltage insulation.

摘要

In this study surface properties of Delrin have been investigated. Delrin is a homopolymer of acetal resin. To study the degradation and the effect of the environment on the surface of this material, samples of Delrin were immersed in saline water with salinities of 0.005-100 mS/cm at 0, 23, 60 and 98 °C. Specimens were also placed in air at these four temperatures. The contact angle of a 4 mu1 sessile droplet of distilled water on the surface of Delrin as a measure of the surface wetability or the hydrophobicity has been measured in this study. Increasing the parameters of temperature, salinity (up to certain level), and the length of time of immersion decreased the contact angle until it reached saturation.; The dc and ac breakdown, water absorption and surface roughness of Delrin were also measured and were found to have correlations with the hydrophobicity of Delrin. After the reduction of hydrophobicity had reached saturation, the specimens were removed from the saline solutions.; The effects of volume of the droplet of distilled water and the time to measure the contact angle after placing the droplet on the surface were also studied. (Abstract shortened by UMI.)