Enhanced dielectric, energy storage and tensile properties of BaTiO3–NH2/low-density polyethylene nanocomposites with POE-GMA as interfacial modifier
Xuanchen Zhao, Yuanjing Bi, Junhao Xie, Jing Hu, Shulin Sun, Shixin Song
Abstract
Dielectric polymer nanocomposites with excellent dielectric performance and high discharge energy storage are important for capacitor applications. In this study, γ-Aminopropyl triethoxysilane (γ-APS) grafted BaTiO3 nanoparticles (BaTiO3–NH2) were used as filler to improve the dielectric and energy storage properties of low-density polyethylene (LDPE). Glycidyl methacrylate grafted ethylene-octene copolymer (POE-GMA) was used as interfacial modifier between LDPE and BaTiO3–NH2 particles. Because of the chemical reaction between the epoxy groups of POE-GMA and the amino groups of BaTiO3–NH2, the soft shell/hard core structure of [email protected]3–NH2 can be formed during the blending process. The BaTiO3–NH2/POE-GMA/LDPE nanocomposites with superior dielectric properties were obtained. When the contents of POE-GMA and BaTiO3–NH2 were 10 wt%, the favorable breakdown strength of 350 MV/m and fine discharged energy density of 2.46 J/cm3 for BaTiO3–NH2/POE-GMA/LDPE blend were achieved. This work provided a useful and easy way to exploit perspective dielectric candidates for energy-storage applications.