Abstract
We report a novel low-density polyethylene (LDPE) composite filled with nickel-coated CaCu3Ti4O12 ceramic (denoted as CCTO@Ni), prepared by a melt mixing technique, and its prominent dielectric characteristics. The effects of magnetic field treatment on the dielectric properties of CCTO@Ni/LDPE composite films with a low filler concentration of 10 vol.% were investigated. Our results show that the dielectric permittivity, loss tangent, and conductivity of the LDPE composite films initially improved and then decreased with increasing treatment time under the applied magnetic field. Magnetic field treatment for 60 min led to an ultra-high dielectric permittivity value of 1.57 × 104, four orders of magnitude higher than that of the pure LDPE material. Our results indicate that the magnetic treatment may have induced a percolation effect and enhanced the interfacial polarization of the CCTO@Ni/LDPE composite, resulting in the observed changes in its dielectric properties.
Highlights
We report a novel low-density polyethylene (LDPE) composite filled with nickelcoated CaCu3Ti4O12 ceramic, prepared by a melt mixing technique, and its prominent dielectric characteristics
Our results show that the dielectric permittivity, loss tangent, and conductivity of the LDPE composite films initially improved and decreased with increasing treatment time under the applied magnetic field
Thomas et al.[11] prepared polyvinylidene fluoride (PVDF)/CCTO composites with a high filler concentration of 55 vol.% via melt mixing and hot pressing processes that displayed high dielectric permittivity (ε ≈ 95) at 100 Hz
Summary
The effects of magnetic field treatment on the dielectric properties of CCTO@Ni/LDPE composite films with a low filler concentration of 10 vol.% were investigated. Our results show that the dielectric permittivity, loss tangent, and conductivity of the LDPE composite films initially improved and decreased with increasing treatment time under the applied magnetic field.
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