Title :
Morphological aspects of water treeingin Co60 γ-ray irradiated polyethylene
Author :
Koo, J.Y. ; Kim, J.T. ; Lee, B.W. ; Ryu, B.H. ; Kim, K.Y. ; Filippini, J.C.
Author_Institution :
Dept. of Electr. Eng., Han Yang Univ., Seoul, South Korea
Abstract :
To understand the effect of crosslinking in polyethylene on the water tree propagation, low-density polyethylene (LDPE) and Co60 γ-ray irradiated polyethylene were used for water treeing tests. Injection molded samples were made of LDPE using the CNRS laboratory model, and some of them were irradiated at different dose rates to produce crosslinking. The aged specimens were subjected to microscopic investigation, using scanning electron microscopy to study the morphology of the fractured surface and polarizing microscopy to study the structure of spherulite. It appears that the different structures found in the irradiated and nonirradiated materials polyethylene could account for the different water tree propagation in these materials
Keywords :
ageing; cobalt; conducting polymers; electric breakdown of solids; fracture; gamma-ray effects; optical microscopy; scanning electron microscope examination of materials; surface structure; γ-ray irradiated polyethylene; CNRS laboratory model; Co60; H2O treeing; aged specimens; crosslinking; dose rates; fractured surface; injection molded samples; low-density polyethylene; morphology; nonirradiated materials polyethylene; polarizing microscopy; scanning electron microscopy; spherulite; treeing; Contacts; Kinetic theory; Needles; Polarization; Polyethylene; Safety; Scanning electron microscopy; Testing; Trees - insulation; Wire;
Conference_Titel :
Conduction and Breakdown in Solid Dielectrics, 1992., Proceedings of the 4th International Conference on
Conference_Location :
Sestri Levante
Print_ISBN :
0-7803-0129-3
DOI :
10.1109/ICSD.1992.225007
