Effect of Titanium on the Dielectric Properties and Corona Resistance Life of Organic–Inorganic Hybrid/Epoxy Composites

ABSTRACT This paper describes the design and synthesis of organic–inorganic hybrid materials (Si‐Ti‐B nanocomposite oxides) using phenyltriethoxysilane (PTES), tributyl borate, and butyl titanate as monomers. The Si‐Ti‐B nanoparticles prepared by this method have a large number of organic groups, which enhances their compatibility with epoxy resin. Organic–inorganic hybrid/epoxy composites (Si‐Ti‐B/EP nanocomposites) were subsequently fabricated via ultrasonic dispersion and thermal curing techniques. The primary aim of this study is to explore how altering the amount of titanium affects the characteristics of Si‐Ti‐B/EP nanocomposites while maintaining a constant Si‐Ti‐B oxide level of 6 wt.%. The experimental results demonstrate that the dielectric coefficient of Si‐Ti‐B/EP nanocomposites has a positive correlation with the titanium element content: the dielectric loss decreases and then increases, and the minimal dielectric loss occurs when the molar ratio of Si, Ti, and B in Si‐Ti‐B composite oxides is 18:0.1:2. When the molar ratio of Si, Ti, and B in the Si‐Ti‐B composite oxide is 18:0.1:2, the corona‐resistant life is 311 min at the working frequency, which is a significant improvement over the pure epoxy resin. The findings indicate that the inclusion of titanium can significantly improve the dielectric properties and corona‐resistant life of Si‐Ti‐B/EP composites.