High-temperature-resistant barium strontium titanate @Ag/poly(arylene ether nitrile) composites with enhanced dielectric performance and high mechanical strength

Novel barium strontium titanate@silver (BST@Ag) hybrid particles with controllable Ag content are fabricated through the surface grafting modification combined with an in situ reduction of Ag+, using (3-mercaptopropyl)trimethoxysilane (MPTMS) as a surface-grafting agent. The surface character of BST nanoparticles changes from initially hydrophilic to lipophilic upon grafting of MPTMS. Polymer composites are then prepared by dispersing the BST@Ag hybrid particles in poly(aryl ether nitrile) (PAEN). Benefiting from improved compatibility and dispersibility between modified particle fillers and the polymer matrix, the BST@Ag/PAEN composites exhibit enhanced dielectric properties, including significantly increased dielectric permittivity, relatively low dielectric loss, and good permittivity-temperature stability below 140 °C. The composites also demonstrate excellent thermal stability and high mechanical strength, offering attractive prospects as high-temperature-resistant dielectric materials for use in various engineering applications.Graphical abstract