Abstract
Below the melting point, polyethylene forms a structure in which the crystalline and the amorphous regions exist together. Therefore, polyethylene is not homogeneous. It is thought that generation of a crack by Maxwell stress is one of the tree initiation causes. The crack is generated easier in an unhomogeneous than in a homogeneous structure. Above the melting point, the homogeneity may increase because all crystalline regions melt into the amorphous region. To examine the homogeneity of polyethylene and the relationship to the generation of electrical trees, polyethylene was heated up to 180 °C. The relationship between the superstructure and the electrical tree initiation voltage at various temperatures was examined. © 1999 Scripta Technica, Electr Eng Jpn, 128(3): 24–30, 1999
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