Poly(p-phenyleneterephthamide) (PPTA) fiber is a high-performance synthetic fiber whose reinforced composites are widely used for their advantages of high strength and light weight. However, the further potential usage of PPTA and its reinforced composite materials is limited in areas due to their high electrical insulation. To improve the electrical conductivity, an online polymerization coating technology was used to manufacture conductive PPTA/polyaniline (PANI) composite yarns continuously, and the conductive PPTA/PANI composite yarns' structure and properties such as surface morphology, electrical conductivity, FT-IR spectra, thermogravimetric performance and mechanical properties were studied in details. Then, three kinds of multi-axial composite materials were prepared by using the conductive PPTA/PANI composite yarn as the reinforcement and unsaturated polyester resin as a matrix, and the electromagnetic shielding performance of the composites was measured. The results indicated that the conductivity of conductive PPTA/PANI composite yarn can reach to ~160 S/m. The thermogravimetric performance of PPTA was reduced after conductive treatment. The mechanical properties of the composite yarns, such as the breaking strength and elongation, remained unchanged when the oxidant concentration was lower than 0.6 mol/L and decreased with the increase in the oxidant concentration. The electromagnetic shielding composites show a certain anti-electromagnetic radiation capability, and the shielding-effectiveness (SE) value increased with the axial number and density of the conductive PPTA/PANI composite yarns. For the tetra-axial composite with a conductive yarn density of 37 yarns per inch, the average SE value in the frequency range of 100 MHz to 1500 MHz can exceed 22 dB http://mc.manuscriptcentral.com/JIT
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