Title :
Physical and chemical structure change of filled epoxy due to water absorption
Author :
Kumazawa, Takao ; Oishi, Manabu ; Todoki, Minoru ; Watanabe, Teiji
Author_Institution :
Chubu Electric Power Co. Inc., Nagoya, Japan
Abstract :
Epoxy composites are widely used for electrical insulation systems. However, the electrical and mechanical properties of them could significantly vary with water absorption. To study the mechanisms of degradation due to water absorption, we observed physical and chemical structure change of filled epoxy and evaluated dielectric properties by accelerated aging. As a result, it was confirmed that the regions of different crosslinked densities were formed in the matrix during accelerated aging. Furthermore, it was suggested that physical structure change, e.g., interfacial debonding between filler and matrix affects dielectric loss but not DC conduction loss. Chemical structure change seems not to affect essentially electrical properties
Keywords :
ageing; chemical structure; composite insulating materials; dielectric losses; environmental degradation; epoxy insulation; filled polymers; sorption; water; DC conduction loss; accelerated ageing; chemical structure; composite; crosslinked density; degradation; dielectric loss; dielectric properties; electrical insulation; filled epoxy; interfacial debonding; mechanical properties; physical structure; water absorption; Absorption; Accelerated aging; Chemicals; Degradation; Dielectric losses; Dielectric measurements; Dielectrics and electrical insulation; Mechanical factors; Temperature; Water;
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.1997.617644
