乳液聚合条件对纳米磁性导电聚苯胺电磁性能的影响  

Effect of emulsion polymerization conditions on the electromagnetic properties of magnetic and conductive polyaniline nanoparticles

作　　者：韩笑[1] 王源升[2] 

机构地区：[1]四川大学高分子材料科学与工程国家重点实验室,成都610065 [2]海军工程大学训练部,武汉430033

出　　处：《功能材料与器件学报》2007年第6期529-536,共8页Journal of Functional Materials and Devices

摘　　要：以十二烷基苯磺酸(DBSA)为乳化剂和掺杂剂,过硫酸铵(APS)为氧化剂,采用乳液聚合的方法合成了导电聚苯胺包覆磁性四氧化三铁的核-壳纳米复合材料,其粒径在120nm左右。利用3cm波导式测量线法分别研究了聚合反应中Fe_3O_4的含量、DBSA和APS与苯胺的相对含量对复合材料的介电常数(ε′,ε″)和磁导率(μ′,μ″)的影响。结果表明,Fe_3O_4的加入能够在提高复合材料磁损耗的同时,提高其介电损耗,μ″和ε″分别提高到0.72和9.62,扩展高频时的吸收频带,通过调整聚合反应中Fe_3O_4、DBSA和APS的相对含量可以调节材料的电磁参数,设计多层的梯度吸波结构,从而满足阻抗匹配定律和对入射电磁波实现最大限度的吸收。Electrically conducting polyaniline （PANI） - magnetic oxide （ Fe3O4 ） composites with electrical and ferromagnetic behaviors were synthesized by the way of emulsion polymerization in the presence of dodecyl benzene sulfonic acid （DBSA） as a surfactant and dopant and ammonium persulfate （APS） as the oxidant. The average diameter of the composites is about 120nm. The effects of the contents of Fe3O4, DBSA and APS in the polymerization on the electromagnetic parameters （ε″,ε′,μ′andμ″） were studied by the permittivity and permeability measurements in the range of 2 - 18GHz. The results show that Fe3 04 can improve the magnetic and dielectric loss of the composites in a wide frequency range, the μ″and ε ″have increased to 0.72 and 9.62 respectively. In order to design the muhilayer gradient absorbing structure, the contents of Fe3O4, DBSA and APS can be adjusted to influence the permittivity and permeability of the composites. As a result, the FGM can be content with the impedance matching and absorb the microwave maximumly.

关 键 词：掺杂态聚苯胺 纳米FE3O4 介电常数 磁导率 

分 类 号：O632.2[理学—高分子化学]