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Combined nitric acid oxidation method and polyaniline (PANl)-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 PANl-coated carbon fiber were investigated by using scanning electron microscope (SEM),UV- Vis 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 from 17.1 to 5.3Ω/sq and the shielding efficiency (SE) value increased from 1.54 to 23.3 dB.
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 fibers were investigated by scanning electron microscope (SEM), UV-Vis 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, 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 analyzes were showed that PANI- coated layer changed the surface morphology. Compared with SCF / acrylic coating, the surface resistivity of PAOSCF / acrylic coating decreased from 17.1 to 5.3 Ω / sq and the shielding efficiency (SE) value incr eased from 1.54 to 23.3 dB.