Al₂O₃@ SiO₂ 核壳纳米球添加对聚丙烯介电和空间电荷特性的影响

In order to study the effect of Al₂O₃ @SiO₂ core-shell nanoparticles on the properties of polypropylene (PP)nanocomposites,spherical Al₂O₃@SiO₂ core-shell nanoparticles were synthesized by the surface precipitation method,and the PP nanocomposites with Al₂O₃@SiO₂ core-shell nanospheres were prepared. The physicochemical properties,dielectric spectra,and space charge properties of PP nanocomposites with different contents of Al₂O₃@SiO₂ nanoparticles were studied. The experimental results show that Al₂O₃@SiO₂ nanospheres reduce the storage modulus of PP nanocomposites and enhance their toughness. The filler content of Al₂O₃@SiO₂ nanospheres has an evident effect on the dielectric properties and space charge properties. When the filler content is low,the core-shell structure of Al₂O₃@SiO₂ nanospheres enhances the compatibility between fillers and the matrix and the interaction in the interface region,which further affects the charge density and carrier mobility. Consequently,the relative permittivity and dielectric loss factor of PP nanocomposites decrease. The heterocharge accumulation is also suppressed,improving PP nanocomposites’dielectric and space charge properties.