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Radiation and thermal ageing studies of polymer materials used in cable insulation in nuclear power plants, 4; Polyvinylchloride (PVC)

原子力発電所のケーブル絶縁として使用される高分子材料の放射線・熱劣化,4; ポリ塩化ビニル(PVC)

出崎 亮; 瀬口 忠男*; 田村 清俊; 大島 武; 島田 明彦; 工藤 久明*

Idesaki, Akira; Seguchi, Tadao*; Tamura, Kiyotoshi; Oshima, Takeshi; Shimada, Akihiko; Kudo, Hisaaki*

ケーブル絶縁材であるポリ塩化ビニル(PVC)の劣化を放射線・熱の複合加速劣化により調べた。実用配合のPVCシート材料を100-135$$^{circ}$$Cの温度範囲において、空気中、線量率1kGy/hのコバルト60$$gamma$$線を照射し、その劣化挙動を引張り試験,重量変化により評価した。その結果、高温で可塑剤が揮発して破断伸びが低下し、高温ほどその挙動が顕著になることが明らかになった。

The degradation of polyvinylchloride (PVC) of cable insulation was investigated by accelerated radiation and thermal ageing. The sheets of PVC as same formulation as cables were subjected to thermal ageing at temperature range 100-135$$^{circ}$$C and/or to radiation ageing by Co-60 $$gamma$$-rays at a dose rate of 1kGy/h in air. The degradation was evaluated by the tensile test and by the weight change. The relations between elongation at break and change of weight by loss of plasticizer were analyzed. At higher temperature, the plasticizer evaporates to cause the decay of tensile properties.

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