聚苯胺包覆短碳纤维的机理及分散稳定性

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

采用硝酸氧化法和聚苯胺原位聚合包覆法对短碳纤维(SCF)进行表面处理,以期改善SCF在涂料中的分散稳定性和物理机械性能.利用XPS、SEM、紫外可见分光光度计、四探针法和同轴法兰装置等,考察了氧化SCF表面的活性官能团和聚苯胺在氧化SCF表面的包覆机理,以及包覆改性后SCF的微观结构、分散性能.结果表明:硝酸氧化法提高了SCF表面的含氧基团,聚苯胺是以化学健的方式包覆在SCF的表面;氧化处理结合聚苯胺包覆处理提高了SCF在涂料中的分散稳定性;相对于未经表面处理的SCF体系,涂层的表面方块电阻从17.1Ω降为5.3Ω.

In order to improve the dispersion stabilities and physico-mechanical properties of short carbon fibers （SCFs） in coatings, the methods of nitric acid oxidation and in-situ polyaniline （PANI） 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 PANI- coated oxidized SCFs is of a sheet square resistance decreasing from 17. 1 Ω to 5.3Ω.