Abstract ▼ AI-Helper

In this study, in order to improve the electrical properties, thermal properties and mechanical properties of carbon fiber reinforced plastics (CFRP), nickel-coated carbon fiber reinforced polypropylene (NiCF/PP) composites were composite through extrusion and injection processes. NiCF/PP pellets we...

In this study, in order to improve the electrical properties, thermal properties and mechanical properties of carbon fiber reinforced plastics (CFRP), nickel-coated carbon fiber reinforced polypropylene (NiCF/PP) composites were composite through extrusion and injection processes. NiCF/PP pellets were produced two feeding methods of NiCF and PP, hopper feeding (H) and side feeding (S), respectively. Their electrical, thermal and mechanical properties were inestigated to understand the feeding effect. The electrical, thermal and mechanical properties of S-NiCF/PP composites were better than those of H-NiCF/PP composites. In particular, the surface resistivity and electromagnetic interference shielding effectiveness (EMI SE) were highly improved. Compared to the H-NiCF/PP composites, the improved properties of the S-NiCF/PP composites may be explained by that the S-NiCF/PP composite has a higher aspect ratio of NiCF than the H-NiCF/PP composite due to reduced shear stress during the compounding process of extrusion and also possibly to increased peel-off phenomenon of nickel-coating layer in the H-NiCF/PP composite during the process. Carbon fabrics in carbon fabric/epoxy prepregs, which are often used for making carbon fiber/epoxy composites in aircraft parts supplying industries and are sometimes discarded as industrial waste in the middle of the composite process, were also recycled by combination of chemical (acetone) soaking and combustion methods. The recycled carbon fabrics (r-CF) were utilized to fabricate recycled carbon fabric/epoxy composites with fresh epoxy resin by compression molding. The composites with sized r-CF (S-r-CF) and with unsized r-CF (U-r-CF) were prepared, respectively. The composites with the as-supplied prepregs (P-CFRP) were also fabricated for comparison. The results indicate that the P-CFRP shows the higher tensile, flexural and impact properties than the U-r-CFRP and S-r-CFRP. The properties of the S-r-CFRP were higher than those of the U-r-CFRP, as expected, due to the sizing effect. This work suggests that the recycled carbon fabrics may be reused as secondary reinforcement of the CFRP materials but further recycling study should be performed to further increase their potential mechanical properties.

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