Improved Electrical and Mechanical Properties of PP/POE Cable Insulation by Long-Chain Branched Polypropylene Synergistic Blending

In this article, the long-chain branched polypropylene (LCBPP) synergistic blending method is proposed to improve the electrical and mechanical properties of polypropylene (PP)/polyolefin elastomer (POE) cable insulation. The results show that 5 wt% LCBPP, 40 wt% POE, and 55 wt% PP synergistic blending cable insulation material could reduce the leakage conductivity to 30.39%–46.24% at different temperatures. The breakdown strength is increased by 23.68%–33.98%. Furthermore, the tensile strength and elongation at break are increased by 20.46% and 16.88%, respectively. The LCBPP synergistic blending method could introduce deeper trap levels, contributing to adjusting carrier transport. Furthermore, the compatibility of PP and POE is improved. The research results provide a reference for the performance modification of PP/POE cable insulation.