Abstract
By means of magnetization treatments at ambient temperature and elevated temperatures, the nano- and micron-bismuth ferrate/low density polyethylene (BiFeO3/LDPE) dielectric composites are developed to explore the material processing method to modify the crystalline morphology, magnetic and dielectric properties. The magnetic field treatment can induce the dipole in the LDPE macromolecular chain which leads to preferred orientation of polyethylene crystal grains to the direction of the magnetization field. The surface morphology of the materials measured by atomic force microscope (AFM) implies that the LDPE macromolecular chains in BiFeO3/LDPE composites have been orderly arranged and form thicker lamellae accumulated with a larger spacing after high temperature magnetization, resulting in the increased dimension and orientation of spherulites. The residual magnetization intensities of BiFeO3/LDPE composites have been significantly improved by magnetization treatments at ambient temperature. After this magnetization at ambient temperature, the MR of nano- and micron-BiFeO3/LDPE composites approach to 4.415 × 10−3 and 0.690 × 10−3 emu/g, respectively. The magnetic moments of BiFeO3 fillers are arranged parallel to the magnetic field direction, leading to appreciable enhancement of the magnetic interactions between BiFeO3 fillers, which will inhibit the polarization of the electric dipole moments at the interface between BiFeO3 fillers and the LDPE matrix. Therefore, magnetization treatment results in the lower dielectric constant and higher dielectric loss of BiFeO3/LDPE composites. It is proven that the magnetic and dielectric properties of polymer dielectric composites can be effectively modified by the magnetization treatment in the melt blending process of preparing composites, which is expected to provide a technical strategy for developing magnetic polymer dielectrics.
Highlights
Polymeric composites filled with nanoscale or micron inorganic particles possess specific nanostructure and excellent dielectric performance, which can be widely applied in various fields of an energy storage capacitor, magnetic information device, microwave absorption, etc. [1,2,3]
Dielectric BiFeO3/Low density polyethylene (LDPE) nano- and micron-composites are prepared with special magnetization treatments at ambient and elevated temperatures in the composite blending process
Dielectric BiFeO3 /LDPE nano- and micron-composites are prepared with special magnetization treatments at ambient and elevated temperatures in the composite blending process
Summary
Polymeric composites filled with nanoscale or micron inorganic particles possess specific nanostructure and excellent dielectric performance, which can be widely applied in various fields of an energy storage capacitor, magnetic information device, microwave absorption, etc. [1,2,3]. Polymeric composites filled with nanoscale or micron inorganic particles possess specific nanostructure and excellent dielectric performance, which can be widely applied in various fields of an energy storage capacitor, magnetic information device, microwave absorption, etc. The polymer magnetic composites have been prominently applied in component separation technology, self-repairing materials and electronic nanodevices [4,5,6]. Nanodielectrics (polymer dielectric nanocomposites) are developing towards functionalization and intelligence, highlighting the flexible designability of polymers. It has become an important research field of dielectric composites to develop pertinent preparation technology and special processing methods
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