Preparation and dielectric properties of polypropylene/ZrO2 composite materials
The surface modification of zirconium oxide(ZrO2)powders was performed through emulsion coating to improve their dispersion in the polypropylene(PP)matrix.The dielectric,thermal,and mechanical properties of the modified ZrO2/PP(PP/g-ZrO2)composites were investigated.The results indicated that the dielectric constant of the PP/g-ZrO2 composites increased to 4.28,and their dielectric loss increased from 0.007 1 to 0.068 at a frequency of 1 kH at a ZrO2 con-tent of 50 wt％.In addition,the thermal stability of the PP/g-ZrO2 composites was significantly improved,and their ten-sile strength reached 38.33 MPa at a ZrO2 content of 20 wt％.Through analyzing the agglomeration state of ZrO2 in the PP matrix before and after modification,the composites achieved optimal overall performance at a ZrO2 content of 30 wt％.
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