【摘要】 随着电器制品、电子器件的商用、军事用和科学应用的迅速增长 ,产生了亟待解决的电磁干扰 (也称作电磁环境污染 )问题 ,电磁干扰屏蔽日益受到关注 .本文从聚苯胺掺杂工艺角度出发 ,通过改变掺杂剂用量和溶剂种类 ,制备出高导电的聚苯胺薄膜 ,并对其电磁屏蔽特性进行了初步的测试与理论分析 ,将屏蔽效能的实测结果与理论计算值进行了比较更多还原

【Abstract】 The increasing use of commercial, military, and scientific electrical products and electronic devices has raised the problem of electromagnetic interference(EMI), also called electromagnetic environmental pollution, so there is an increased interest in EMI shielding. By use of mechanical mixing doping method, highly conducting polyaniline films were prepared by the variation of dopant loading and solvent types. When dopant camphor sulphonic acid/emeradine base repeat unit molar ratio is 0.5/1, the conductivity of doped PANI is maximum. The conductivity results show that using m \|cresol as solvent is better than N \|methyl\|2\|pyrrolidinone(NMP).The mechanical mixing doping method is better than other doping methods. It employs less solvent and less dopant. The maximum conductivity of the prepared films is up to 370?S/cm. The total shielding efficiency( SE T) of highly conducting polyaniline films was measured at 10?GHz of microwave frequency. The dependence of SE T on thickness of polyaniline films was studied. When the thickness of the film is 18?μm, the calculated SE T is up to 40?dB. The SE T result shows that the electromagnetic shielding property of highly conducting PANI film can meet the desire of commercial standard. Electromagnetic shielding efficiencies of films with different thickness are calculated by the far\|field shielding theory. The practical measured SE T values are compared with the calculated values. It is found that the measured SE T values are very consistent with the theoretically calculated ones.更多还原