The silane coupling agent KH550 was used to modify the carbon black surface to improve the dielectric properties of composites, and poly （ vinylidene fluoride） with barium titanate to made composites, the dielectric properties of the composites were investigated. The results show that modification improves the surface structure of carbon black and increases the dielectric constant of the carbon black/poly （vinylidene fluoride） composites by more than 15% at 104 Hz. After filling the BT in composites the dielectric constant furthe...
