The effect of crystallinity at the dielectric breakdown strength according to the cooling rate for insulating layer of cable
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Polypropylene is used for replacing crosslinked polyethylene(XLPE) which was previously used as insulating materials for cable. For high heat-resisting property and flexibility, PP blends that were blended with Styrene ethylene butylene styrene(SEBS) were used and fabricated by melting mixing. The mechanical properties, morphology, and dielectric breakdown were measured by Universal Test Machine(UTM) and Scanning Electron Microscope(SEM) respectively. In mechanical properties, the tensile strength was decreased but elongation was increased according to the samples had higher rubber contents. Morphology and dielectric breakdown strength showed difference according to the cooling rate. This study researched the relationship between dielectric breakdown strength and cooling rate.