Study on the dielectric properties of UV-curable resin based nanocomposites containing BaTiO3@TiO2 prepared by electrospinning

In the composites material system with high permittivity which used in the preparation of dielectric functionally graded materials
$(\boldsymbol{\varepsilon}-\mathbf{FGM})$
by stereolithographic (SLA), the high permittivity inorganic ceramic barium titanate (BaTiO
3
, 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 BaTiO
3
and UV-curable resin would like to reduce the breakdown strength of the composites. In order to solve the above problems, in this study, BaTiO
3
nanofibers (BT NFs) were first prepared by electrospinning method, and then BaTiO
3
@TiO
2
nanofibers (BT@Ti NFs) with core-shell structure were prepared by coating Titanium dioxide (TiO
2
, 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.