In the composites material system with high permittivity which used in the preparation of dielectric functionally graded materials (e-FGM) by stereolithographic (SLA), the high permittivity inorganic ceramic barium titanate (BaTiO3, BT) is usually used as the filler for UV-curable resin. However, the severe electric field distortion caused by the excessive difference in the permittivities between BaTiO3 and UV- curable resin would like to reduce the breakdown strength of the composites. In order to solve the above problems, in this study, BaTiO3 nanofibers (BT NFs) were first prepared by electrospinning method, and then BaTiO3@TiO2 nanofibers (BT@Ti NFs) with core-shell structure were prepared by coating Titanium dioxide (TiO2, Ti) on the surface of BT NFs by solution method, and finally mixed with UV-curable resin to prepare the UV/BT@Ti NFs composites. The experimental results show that the permittivity and breakdown strength of UV/BT@Ti NFs composites are higher than those of UV/BT NFs composites.

composites, -FGM, electrospinning, core-shell structure