J. Mater. Sci. Technol. ›› 2007, Vol. 23 ›› Issue (04): 529-534.

• 论文 • 上一篇    下一篇

Performance of Polyaniline-coated Short Carbon Fibers in Electromagnetic Shielding Coating

喻冬秀;程江   

  1. 华南理工大学化工与能源学院
  • 收稿日期:2006-10-04 修回日期:2007-01-10 出版日期:2007-07-28 发布日期:2009-10-10
  • 通讯作者: 喻冬秀

Performance of Polyaniline-coated Short Carbon Fibers in Electromagnetic Shielding Coating

Dongxiu YU, Jiang CHENG, Zhuoru YANG   

  1. School of Chemical and Energy Engineering, South China University of Technology, Guangzhou 510640, China
  • Received:2006-10-04 Revised:2007-01-10 Online:2007-07-28 Published:2009-10-10
  • Contact: Dongxiu YU

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摘要： 采用硝酸氧化法和聚苯胺原位聚合包覆法对短碳纤维进行了表面处理，以期改善碳纤维在涂料中的分散性、电性能以及机械物理性能。利用紫外可见分光光度计，四探针法和同轴法兰装置等方法，系统的研究了含５０ｗｔ％包覆改性后的短碳纤维（SCF）的丙烯酸涂料的分散稳定性和电性能。利用光电子能谱（XPS）考察了氧化碳纤维表面的活性官能以及聚苯胺在氧化碳纤维表面的包覆机理。结果表明，硝酸氧化法提高了碳纤维表面的含氧基团，聚苯胺是以化学健的方式包覆在碳纤维的表面。ＳＥＭ图片和结果分析说明ＰＡＮＩ包覆层提高了碳纤维的粗糙度。氧化处理结合聚苯胺包覆处理法提高了碳纤维在涂料中的分散稳定性。相对SCF体系，涂层的表面电阻从17.1Ω/□降为5.3Ω/□，SE值从1.54dB提高到23.3dB。

关键词: 碳纤维, 聚苯胺, 表面处理, 分散稳定性, 屏蔽效

Abstract: Combined nitric acid oxidation method and polyaniline (PANI)-coated method were applied to modify the surface properties of short carbon fibers (SCF). The electrical and mechanical properties of acrylic coatings with 50 wt pct PANI-coated carbon fiber were investigated by using scanning electron microscope (SEM), UVVis spectrophotometer, four-probe method and the coaxial cable method. The results of the pH measurement and XPS (X-ray photoelectron spectroscopy) patterns showed that the oxygen functional groups, such as -OH and -COOH, were attached on the carbon fiber surfaces after oxidation treatment. The XPS analysis of PANI-coated oxidized SCF (PAOSCF) revealed that PANI may bond on the surface of oxidized SCF with chemical bonds. SEM images and surface roughness analyses showed that PANI-coated layer changed the surface morphology. Compared with SCF/acrylic coating, the surface resistivity of PAOSCF/acrylic coating decreased from17.1 to 5.3 Ω/sq and the shielding efficiency (SE) value increased from 1.54 to 23.3 dB.

Key words: carbon fibers, polyaniline, surface treatment, dispersion stability, shielding effectiveness