Effects of Natural Rubber on Microwave Absorption Characteristics of Some Li-Ni-Zn Ferrite-Thermoplastic Natural Rubber Composites

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A microwave (Li_<0.5>Fe_<0.5>)_<0.4>Ni_<0.3>Zn_<0.3>Fe_2O_4 (LNZ) ferrite was prepared by a conventional sintering method in air. Thermoplastic natural rubber (TPNR) was prepared from polypropylene (PP) and natural rubber (NR) in the ratios of 80 20, 70: 30, 60 40, 50: 50 and 40 : 60 with liquid natural rubber as a compatibilizer by a melt blending technique. LNZ ferrite-TPNR composites with 20 wt% ferrite filler were prepared using a Brabender plasticorder internal mixer. The microwave electromagnetic properties of the composites were studied in the frequency range of 0.3-13.5 GHz using a microwave vector network analyzer (MVNA). The real and imaginary components of the relative complex dielectric permittivity (ε_r =ε'_r - jε''_r) and magnetic permeability (μ_r =μ_r' - jμ_r'') were calculated from the measured complex scattering parameters (S_<11> and S_<12>) using the Nicolson-Ross model. The dielectric and magnetic properties were found to depend on the NR and PP content in the composites. The minimum reflection loss (R_L) under the matching conditions increases with increasing NR content.
社団法人応用物理学会の論文
2002-09-15