聚苯乙烯-磁性吸收剂复合材料微波吸收特性研究

Preparation and microwave absorbing capability of polystyrene/magnetic filler composite

采用铁氧体和铁合金纳米晶材料组成的磁性吸收剂对回收的聚苯乙烯泡沫塑料进行复合电磁改性处理,得到聚苯乙烯-磁性吸收剂复合材料;使用微波矢量网络分析仪系统测量复合材料试样的复磁导率、复介电常数频谱特性及材料标样的电磁波吸收性能。结果表明,随磁性吸收剂含量增加,复合材料磁性和介电性增强,当磁性吸收剂质量含量达15%(质量分数)时,复合材料具有明显的吸波材料特性,在2～18GHz频段呈现多个共振型电磁能吸收峰,2GHz附近的损耗吸收峰值达-12dB;电磁改性的聚苯乙烯复合材料在原有的隔热、隔音特性基础上可兼具吸波性能,成为一种颇具应用价值的多功能材料。

The recycled polystyrene was modified by magnetic fillers composing of ferrite and iron-alloy. Complex permeability, complex permittivity and microwave absorbing capability of such polystyrene/magnetic filler composite were measured by vector-network-analyzer. Results show that magnetism and polarization become stronger when the content of magnetic filler becomes more. Good microwave absorbing capability presents when the mass content reaches 15%. A few peaks of microwave absorbing in 2-18GHz appear and the peak value around 2GHz is -12dB. The modified polystyrene composite becomes multi-functional material presenting heat insulation, sound insulation and microwave absorbing abilities.