Initiation mechanism of electrical tree — chain scission by injected charge and role of oxygen
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We made extensive studies on treeing phenomena of polyethylene. The treeing resistance at 77 K is much higher than that at room temperature [1]. We also reported that the ac tree starting voltage at room temperature is drastically increased by degassing of sample; the removal of oxygen absorbed in polymer suppresses the tree channel growth [2].
[1] Kenji Horii,et al. The Space Charge Behavior and Luminescence Phenomena in Polymers at 77 K , 1979, IEEE Transactions on Electrical Insulation.