Abstract
In this paper, XLPE samples were placed in air and silicone oil for thermal aging, respectively. Besides, the samples were tested by differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA). Then the thermal endurance properties of XLPE were also investigated. The results show that the variation of the thermal endurance properties of XLPE with aging time was highly related to the content of antioxidants in the samples. When the content of antioxidants was above the critical value, the melting temperature and initial decomposition temperature of XLPE just drop slightly and the variation of the melting temperature and initial decomposition temperature is irrelevant to the heating media. In contrast, when the content of antioxidants was below the critical value, the melting temperature and initial decomposition temperature of XLPE aged in air would drop sharply. In addition, when the samples are aged in silicone oil for a long but limited time, the variation of thermal endurance properties is close to the results of running cables.
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