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Thermal aging, water absorption, and their multiple effects on tracking resistance of epoxy for outdoor use
Author(s) -
Kumagai Seiji,
Xinsheng Wang,
Yoshimura Noboru
Publication year - 2000
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/(sici)1520-6416(200003)131:3<9::aid-eej2>3.0.co;2-m
Subject(s) - epoxy , absorption of water , materials science , composite material , absorption (acoustics) , tracking (education) , thermal resistance , thermal , polymer , thermodynamics , psychology , pedagogy , physics
The correlation between tracking resistances of outdoor polymer insulating materials and ambient environmental stresses has been studied. In this study, the tracking resistance variation of a cycloaliphatic epoxy resin filled with high concentration silica powder is investigated as a function of thermal aging and water absorption. Experimental works show that the tracking resistance of this epoxy system is decreased considerably by thermal aging and water absorption. The decrease due to water absorption is found to be an apparent phenomenon because on complete drying treatment, the tracking resistance recovers to its initial state. The combined effect of thermal aging and water absorption makes the tracking resistance decrease to a greater extent than each stress individually. In addition, the tracking resistance of epoxy that is aged by thermal treatment and further water absorption‐drying treatment cannot recover to its pre‐water‐absorption state. Mechanisms of the tracking resistance variations of this epoxy system resulting from thermal aging and water absorption are discussed. © 2000 Scripta Technica, Electr Eng Jpn, 131(3): 9–18, 2000