摘要
用蔗糖-硝酸盐法制备钡铁氧体,用原位聚合沉积技术在其表面包覆了一薄层聚苯胺。扫描电镜结果显示,聚苯胺包覆钡铁氧体后表面形貌发生明显改变;红外光谱和物理性能测试系统结果表明,在钡铁氧体颗粒表面和聚苯胺间存在某种化学作用;微波网络分析仪测试表明,在2～16 GHz频率范围内,复合材料的复磁导率变化不大,复介电常数有明显增加,主要是由于聚苯胺在电场作用下的极化,铁氧体和聚苯胺之间形成大量的界面,增强了不同介质之间的界面极化所致。
Ferrite particles were prepared using sucrose-nitrate process. The continuous coverage of a polyaniline had been produced on the ferrite particle surface by an in-situ polymerization deposition technique. The results of FTIR and PPMS analyses indicated the existence of an interaction between polyaniline macromolecule and magnetic particles in the composites, which influenced the composites＇ physical and chemical properties. The complex permittivity and the complex permeability were investigated in the frequency range of 2-16GHz. It was shown that the microwave electromagnetic parameters of the polyaniline-coated barium ferrite composite particles were improved significantly by means of the coated structure. Especially, the complex relative permittivity of the coated barium ferrite composite was much higher than that of the uncoated barium ferrite particles in the most frequency range. The interaction and interfacial polarization, as well as the present of polyaniline, were seen as contributing factors to the increase in the complex relative permittivity.
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2006年第5期45-48,共4页
Ordnance Material Science and Engineering
关键词
原位聚合
聚苯胺
钡铁氧体
复合材料
电磁特性
in-situ polymerization
polyaniline
barium ferrite
composites
electromagnetic properties
