Enhancement of Dielectric Properties of Photosensitive Composites Based on Perfluorosilane-modified BaTiO3Nanoparticles

Dielectric functionally gradient materials (d-FGM) provide a new strategy for the uniform distribution of electric field in insulators. The fabrication and application of d-FGM are based on the adjustable dielectric constant of composites, while the composite materials have excellent electrical insulation performance. The interfacial interactions between nanoparticles and matrix play a key role in the above issue. Herein, perfluorosilane (FAS-17) was adopted to modify the surface of nano-BaTiO
₃
particles, and BaTiO
₃
/UV-cured resin composites were prepared. The modified particles were characterized by FT-IR, XPS, TGA and water contact angle. The effects of surface-treated BaTiO
₃
particles on the dielectric constant, dielectric loss and volume resistivity of photosensitive composites were systematically studied. The results show that the molecule of silane coupling agent (FAS-17) is chemically grafted on the surface of BaTiO
₃
. Compared with the unmodified composite, the improvement of interface adhesion may be responsible for the effective enhancement of electrical insulation properties of the modified composites, which makes this material a promising potential to be d-FGM based on stereolithography (SLA).