極低温領域における有極性高分子フィルムの絶縁破壊

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  • Electrical Breakdown of Polar Polymeric Films in Cryogenic Temperature Region
  • キョクテイオン リョウイキ ニ オケル ユウキョクセイ コウブンシ フィルム

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Using newly developed specimen for the measurement of intrinsic electric strengths of polymeric films at cryogenic temperature, the dielectric breakdown characteristics of polar polymeric (Polyvinyl Chloride, PVC) films were studied. The DC electric strengths of PVC film measured with this specimen increased with decrease of temperature, and decreased after showing a peak around 200K. Below 150K they were almost constant. This temperature dependence is quite different from those already reported with recessed specimens. Since the recessed specimens made of the same PVC material gave almost the same temperature dependence as that reported, the present results are inherent to the elongated film specimens. The dependence of electric strengths on the rise rate of applied field and the prestressing showed the electrical breakdown of polar polymers at cryogenic temperature are affected by the space charge effect. Although it has been open question why DC electric strengths of polar polymers show a negative temperature dependence in low-temperature region, it becomes clear from this study that the appearance of this dependence is closely related to the space charge formation.

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