Journal of South China University of Technology (Natural Science Edition) ›› 2007, Vol. 35 ›› Issue (7): 72-77.

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

Coating Mechanism and Dispersion Stability of Polyaniline-Coated Short Carbon Fibers

Yu Dong-xiu  Chen Ming-tao  Wen Xiu-fang  Cheng Jiang  Yang Zhuo-ru   

  1. School of Chemical and Energy Engineering , South China Univ. of Tech. , Guangzhou 510640 , Guangdong , China
  • Received:2006-10-26 Online:2007-07-25 Published:2007-07-25
  • Contact: 喻冬秀(1977-)，女，博士生，主要从事电磁屏蔽涂料的研究. E-mail:yudongxiu@sina.com
  • About author:喻冬秀(1977-)，女，博士生，主要从事电磁屏蔽涂料的研究.

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Abstract:

In order to improve the dispersion stahilities and physico-mechanical properties of short carbon fibers ( SCFs) in coatings , the methods of nitric acid oxidation and in -situ polyaniline (P ANI) coating were adopted to modify the surface properties of SCFs. Then , by means of XPS , SEM , UV -Vis , four-point probe measurement and coaxial cable method , the activated functional groups on the modified SCF surface , the microstructure and dispersion
stability of the modified SCFs and the coating mechanism of PANI on the SFC surface were investigated. The results indicate that the nitric acid oxidation helps to increase the oxygen-containing functional groups , that the oxidation combined with the PANI coating on the SCF surface via chemical bonds helps to improve the dispersion stability of SCF in the coating , and that , as compared with the coating with the original SCFs , the coating with PANIcoated oxidized SCFs is of a sheet square resistance decreasing from 17. 1 Ω to 5. 3 Ω.

Key words: short carbon fiber, polyaniline, coating, mechanism, dispersion stability