Preparation and Electromagnetic Characteristic of Magnetic and Conductive Modified Short Carbon Fibers

Combined the nitric acid oxidation method and in-situ polymerization method were applied to prepare two kinds of electromagnetic modified short carbon fibers (SCF), coated with aniline/magnetic liquid and aniline/magnetic powder. The morphology and element contents of the modified SCF were investigated by using SEM, EDS and XRD. The complex permittivity and complex permeability of the modified SCF were measured by Agilent PNALN5230A microwave network analyzer in 50MHz-2GHz band. The absorption loss was simulated by Matlab6.5 software. SEM observation indicated the polyaniline/magnetic liquid coating of modified SCF was integrated and compact, but the polyaniline/magnetic powder coating of modified SCF was integrated and incompact. The Fe element contents of the polyaniline/magnetic liquid coated SCF (modified SCF-A) and polyaniline/magnetic powder coated SCF (modified SCF-B) were 2.86at% and 3.12at%, respectively. The real part of the complex permittivity of modified SCF-A was higher than that of modified SCF-B, on the contrary, the imaginary part of the complex permittivity and the complex permeability of the modified SCF-A were lower than that of the modified SCF-B. The absorption loss of modified SCF-A and modified SCF-B were 3.06dB and 4.14dB, respectively.