Title :
Recovery of hydrophobicity of ethylene propylene diene monomer aged by heat and saline water
Author :
Tokoro, Tetsuro ; Hackam, Reuben
Author_Institution :
Gifu Nat. Coll. of Technol., Japan
Abstract :
The recovery of hydrophobicity of ethylene propylene diene monomer (EPDM) insulator after aging by long exposure to a stress of saline water at different temperatures is investigated. The hydrophobicity is determined by measuring the contact angle of a droplet of distilled water on EPDM rubber. The aging of EPDM rubber was done by immersing it for up to 576 h in saline water solutions in the range 5.0-105 μS/cm. The aging temperatures were 0, 25, 50, 75 and 98°C. After aging, the specimens were kept in air at room temperature for up to 2,500 h during which the recovery of hydrophobicity and weight changes were measured. From these results, surface free energy and diffusion coefficients of EPDM rubber were evaluated
Keywords :
ageing; contact angle; environmental degradation; ethylene-propylene rubber; humidity; recovery; surface diffusion; surface energy; water; 0 degC; 25 degC; 50 degC; 576 to 2500 h; 75 degC; 98 degC; EPDM insulator; EPDM rubber; aging; aging temperatures; air; contact angle; different temperatures; diffusion coefficients; distilled water droplet; ethylene propylene diene monomer; heat; hydrophobicity recovery; long exposure; room temperature; saline water; surface free energy; weight changes; Aging; Goniometers; Heat recovery; Insulation; Pollution measurement; Rubber; Stress; Surface contamination; Temperature; Water heating;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1997., Proceedings of the 5th International Conference on
Conference_Location :
Seoul
Print_ISBN :
0-7803-2651-2
DOI :
10.1109/ICPADM.1997.617533
