Title :
Diffusion of low molecular weight siloxane from bulk to surface [outdoor insulators]
Author :
Homma, H. ; Kuroyagi, T. ; Mirley, C.L. ; Ronzello, J. ; Boggs, S.A.
Author_Institution :
Electr. Eng. Dept., Central Res. Inst. of Electr. Power Ind., Yokosuka, Japan
Abstract :
Silicone-based materials for outdoor insulators have the advantage that low molecular weight (LMW) components migrate through the material and coat the surface, thereby restoring hydrophobicity over a period of hours. By measuring the infrared (IR) absorption of siloxane migrating to the silicone surface through a thin carbon coating, the aspect of the LMW siloxane migration was observed as a real time plot and the time constant of the migration was calculated. According to the time dependence of IR-absorbance, the migration mostly saturated within only 12 hours after the carbon coating was applied. Also, the time constant showed a dependence on the concentration of added filler in the silicone samples
Keywords :
silicone insulation; bulk to surface diffusion; hydrophobicity; infrared absorption; low molecular weight siloxane; outdoor insulators; thin carbon coating; time constant; Carbon dioxide; Chemicals; Coatings; Dielectrics and electrical insulation; Electric variables measurement; Electromagnetic wave absorption; Plastic insulation; Pollution measurement; Spectroscopy; Temperature;
Conference_Titel :
Electrical Insulation, 1996., Conference Record of the 1996 IEEE International Symposium on
Conference_Location :
Montreal, Que.
Print_ISBN :
0-7803-3531-7
DOI :
10.1109/ELINSL.1996.549336
