摘要
采用玻璃布作为分散载体制备多壁碳纳米管／玻璃纤维／环氧树脂复合材料，研究了在26．5～40GHz频段，多壁碳纳米管的含量对复合材料的电磁参数及电导率的影响，同时测量了复合材料在该波段的电磁波反射率。研究结果表明：随多壁碳纳米管含量的增加，其介电常数实部和虚部随之增加，介电损耗角正切提高了4倍。复合材料的磁导率随多壁碳纳米管含量的提高变化不明显，呈弱磁性。复合材料的电导率随多壁碳纳米管含量的增加，由原来的绝缘体变为半导体。另外，在26．5～40GHz频段内多壁碳纳米管复合材料对电磁波的隐身效果不好。
The unique structure of carbon nanotubes （CNTs） has prompted intensive study for special electromagnetic properties. For the multiwalled carbon nanotubes （MWCNTs）, the research work on electromagnetic properties is seldom reported. In this work, MWCNTs/glass fabrics （GF）/epoxy （EP） composites were produced by selecting the glass fabric as carriers to help MWCNTs to disperse. Then the permittivity, magnetic conductivity, reflection loss, electrical conductivity and morphology of the composites with different contents of MWCNTs in the wave band from 26.5 to 40 GHz were researched respectively. It is found that the real part and imaginary part of permittivity increase with the content of MWCNTs. Especially for the dielectric loss tangent, it has been increased by four times. However, the magnetic conductivity stays around the level of one （μ=1） and the composites present less-magnetic properties. Moreover, the MWCNTs/GF/EP composite can be changed from the insulator to the semiconductor along with increasing the content of MWCNTs. In the electromagnetic wave band （26.5～40 GHz）, the effect of absorbing is not satisfying for the MWCNTs/GF/EP composites.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2008年第4期78-83,共6页
Acta Materiae Compositae Sinica
