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The present work focuses on the effect of water tree development on crystalline structure of lowdensity polyethylene (LDPE). LDPE samples with 5 mm in thickness are prepared by the hotpressing method, and then aged by the water-needle method at a voltage of 6 kV/5 kHz. After aging for 250, 500 and 750 hours, the cultivated water trees are observed in the anatomical sections of the samples. In order to study the crystalline structure, differential scanning calorimetry (DSC) and Ramandoi:10.1109/tdei.2020.009120 fatcat:e3kyw6jdqfbilaiglwm4ga5cpa