Degradation of Dielectric Properties of Polyethylene by Combination of γ-Irradiation and Thermal Aging
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概要
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It has been found that the application order of thermal aging and γ-irradiation causes a different degradation of mechanical properties of insulating materials. In this review, we focus in depth on oxidative degradation and degradation of dielectric properties of polythylene under combined thermal aging and γ-irradiation. To exclude the effect of additive agents and to minimize the effect of the process limited by diffusion of oxygen on degradation, a 25 μm thick low-density polyethylene film free from additives has been used. It has been clarified that the simultaneous application of thermal aging and γ-irradiation causes the most oxidative degradation, while the single application of γ-irradiation exhibits the largest loss tangent on dielectric property for the same oxidative degradation. According to the order of the application of thermal aging and γ-irradiation, there is a great differences of oxidative degradation and degradation of dielectric properties. The results have been also explained in terms of gel fraction and crosslinking.
- Faculty of Engineering, Mie Universityの論文
- 1987-12-20
Faculty of Engineering, Mie University | 論文
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