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-BaTiO3particles, and BaTiO3/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 BaTiO3particles 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 BaTiO3. 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).