Electrical Performance of Environmentally Friendly Polypropylene-based Cable Materials Modified by SiO₂@PDA

Abstract Polydopamine-coated silica nanopowder SiO 2 @PDA was prepared, and SiO 2 @PDA powder and polypropylene (PP) substrate were melt blended by melt mixing method to obtain SiO 2 @PDA-modified polypropylene cable materials. SEM test, X-ray diffraction (XRD) test, breakdown field strength test, dielectric constant test and oxidation induction period test were performed. The results showed that PDA-coated SiO 2 nanoparticles improved the interfacial compatibility of SiO 2 nanoparticles with polypropylene matrix and the dispersion of SiO 2 nanoparticles in the main insulating material of polypropylene cables. Blending modification of PP cable main insulators using SiO 2 @PDA powder can enhance the electrical properties and heat and oxygen aging resistance of PP cable main insulators.