PVDF/SiO2@BST82电介质复合材料介电性能的研究OA

Using poly(vinylidene fluoride)(PVDF)as the matrix and SiO2-coated barium strontium(SiO2@BST82)core-shell structured inorganic nanoparticles as the filler,PVDF/SiO2@BST82 dielectric composite films with different mixing ratios were prepared via the spin coating method.The influence of SiO2@BST82 filler volume fraction on the phase structure and dielectric breakdown performance of the composite films was investigated.X-ray diffraction patterns confirmed the successful preparation of SiO2@BST82 inorganic nanoparticles,and the incorporation of these fillers inhibited the crystallization of the PVDF matrix.The dielectric constant of the composite films increased with rising filler content.However,when the filler volume fraction exceeded 5%,the introduction of interfaces generated numerous micro-defects,leading to increased dielectric loss.The addition of SiO2@BST82 fillers caused a decreasing trend in the breakdown field strength of the composites.In the PVDF/SiO2@BST82 composite system,peaks and valleys emerged in the dielectric constant temperature spectra as the filler volume fraction increased.At a SiO2@BST82 filler volume fraction of 3%,the composite film exhibited favorable dielectric temperature stability,and its breakdown field strength decreased to a lesser extent compared to composite films with other filler loadings,demonstrating overall superior performance.The dielectric constant,dielectric loss,and breakdown field strength of the composite film measured at room temperature and 100 Hz were 10.490,0.037,and 141.550 MV/m,respectively.An optimized ratio enhanced the dielectric properties,breakdown performance,and temperature stability of PVDF-based composite films.The study results provided guidance for the preparation of high-performance dielectric composite films.