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纳米Fe3O4是典型的顺磁性材料,将其与低密度聚乙烯(low density polyethylene,LDPE)复合,会给LDPE基体的磁、电等性能带来影响。为研究纳米Fe3O4加入对LDPE介电性能的影响,采用共沉淀法制备纳米级Fe3O4,并用不同方法对其进行改性,制备了不同条件的纳米Fe3O4粒子。将此纳米Fe3O4按质量分数0.25%～1%分别以熔融共混法与LDPE复合制得Fe3O4与LDPE的复合材料。以宽频介电谱仪进行了该Fe3O4与LDPE复合材料介电谱的研究,试验结果表明:纳米Fe3O4的加入及磁化对LDPE的介电常数和介电损耗均有影响,且其大小与掺杂方法及纳米Fe3O4质量分数有关。
Nano-Fe3O4 is a typical paramagnetic material, which composites with low density polyethylene (LDPE), which will affect the magnetic, electrical and other properties of LDPE matrix. In order to study the influence of nano-Fe3O4 on the dielectric properties of LDPE, Fe3O4 nanoparticles were prepared by co-precipitation method and modified by different methods to prepare Fe3O4 nano-particles with different conditions. The nano-Fe3O4 mass fraction of 0.25% to 1% by melt blending with LDPE composite Fe3O4 and LDPE composite material. The dielectric spectra of the Fe3O4 and LDPE composites were studied by using a broadband dielectric spectrometer. The experimental results show that the addition and magnetization of Fe3O4 have influence on the dielectric constant and dielectric loss of LDPE, and their sizes and doping Methods and nano-Fe3O4 mass fraction related.