高压电缆用半导电屏蔽料导电网络结构与性能关系研究OA

Ethylene-butyl acrylate copolymer(EBA)was employed as the matrix resin,and a highly conductive carbon black(CB)was used as the conductive filler to fabricate semi-conductive shielding materials via melt blending,with CB loadings varied from 18 wt%to 34 wt%.The results show that increasing CB content significantly reduces the volume resistivity,weakens the positive temperature coefficient(PTC)effect,and enhances the thermal stability of electrical properties.At a CB loading of 34 wt%,the shielding material presents a room-temperature volume resistivity of 11.4 Ω·cm along with a PTC of 11.7.The tensile strength exhibits a non-monotonic trend,initially increasing and then decreasing with higher CB content,while the elongation at break consistently declines.Dynamic mechanical analysis re-veals that the percolated CB network strengthens interfacial interactions within the composite,thereby increasing both the storage modulus and loss modulus,while simultaneously restricting segmental mobility and chain slippage of the EBA matrix.Rheological measurements further confirm that all formulations display typical shear-thinning behavior,with the storage modulus,loss modulus,and complex viscosity progressively rising as CB content increases,indicative of a well-developed conductive filler network.