Characteristics of Formation and Decay of Interfacial Charge near the Interface between PE and EVA

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  • PE/EVA界面での界面電荷形成減衰特性
  • PE EVA カイメン デ ノ カイメン デンカ ケイセイ ゲンスイ トクセイ

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Abstract

This paper describes research on the formation and decay processes of interfacial interfacial charge in PE/EVA laminates. At the interface between PE and EVA, charge of the order of 10-100μC/m2 accumulated when a D.C. voltage of up to 15kV (30kV/mm) was applied to PE/EVA laminates. The interfacial charge decreases exponentially with at least two time constants and depends on the polarity of the applied voltage. For the case of PE/EVA (VA=19wt%), one time constant is in the range of 1.2-1.7 [hrs] and the other is in the range of 3.9-9.5 [hrs]; these constants are of the same orderas those for single sheet EVA and LDPE, respectively. As the amount of VA in EVA increased, the first time constant was found to decrease more rapidly. Increasing the amount of VA in EVA increased the electric conductivity of the EVA and the charge in the EVA side but decreased the time coustant for decay in the EVA. The decay time constant was found to be proportional to abort 0.4 power of dielectric relaxation time.

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