Preparation and properties of BiFeO3/LDPE nanocomposite

摘要

BiFeO/LDPE nano-dielectric films of different BiFeO nanoparticles percentages including 0.5%, 1%, and 2% have been successfully prepared using solution-melt blending method in the spiral double pole rheometer. The BiFeO/LDPE nanocomposite films were characterized by SEM (scanning electron microscopy), FT-IR (Fourier transform infrared), and XRD (X-ray diffraction). The dielectric properties were tested by the broadband dielectric spectrometer. The experimental results show that BiFeO nanoparticle fillers are homogeneous dispersion in LDPE matrix and the structure of LDPE has not been changed even after doping with BiFeO nanoparticles. It can be seen that dielectric constants of all samples have small extent of variation with frequency from 10 to 10 Hz. Except 0.5 wt.%, dielectric constants are increase with increased of contents of BiFeO, and dielectric constant increases up to 2.6 which is increased 16% than that of the pristine LDPE. The dielectric loss of BiFeO/LDPE nanocomposites indicate that they have a low dielectric loss in the range of 10 to 10 Hz and the variation of dielectric loss is very small even when contents of BiFeO with 0.5 wt.% and 1 wt.% than pristine LDPE, but a increase was obversed when content of BiFeO nanoparticles reached 2 wt.%. The variation tendency is because of different polarization mechanisms.