Core-shell structured BaTiO3@polymer hybrid nanofiller for poly(arylene ether nitrile) nanocomposites with enhanced dielectric properties and high thermal stability

To develop high-performance dielectric materials, we report a novel strategy to fabricate core-shell structured BaTiO3@polymer nanoparticles through rotary coating technology combined with a post-treatment bonding process, by using carboxyl-functionalized poly(arylene ether nitrile) (CPAEN) as the polymeric surface-grafting agent. The results demonstrated that the CPAEN was chemically bonded on the surface of BaTiO3 core through monodentate coordination of carboxyl groups, and the BaTiO3 core was completely wrapped by a stable CPAEN shell with a uniform thickness of 4-7 nm. Furthermore, polymer nanocomposites were prepared by using core-shell structured BaTiO3@CPAEN nanoparticles as hybrid nanofillers and poly(arylene ether nitrile) (PAEN) as the polymer matrix. The results indicated that the nanocomposites exhibited enhanced dielectric properties, such as relatively high dielectric permittivity, quite low loss tangent and good permittivity-frequency stability, and excellent thermal stability, high mechanical strength and good flexibility. Therefore, it provides a path to obtain a new class of high-temperature-resistant dielectric materials for various engineering applications.