Carbon fiber (CF)-reinforced polyamide 6 (PA6) composites have an excellent performance, attributed to properties such as light quality, high strength, and vibration reduction, and they are widely used in fields such as aerospace and transportation. Four kinds of carbon fiber-reinforced polyamide 6 (CF/PA6) composite pellets with carbon fiber contents of 20, 30, 40, and 50 wt.% were prepared using twin screw extrusion. The results were characterized using a simultaneous thermal analyzer, capillary rheometer, electronic universal material testing machine, and scanning electron microscope (SEM); their crystallization, rheological behavior, mechanical properties, surface structure, etc., were studied. DSC results indicate that an increase in carbon fiber content enhances the thermal stability of CF/PA6 and narrows the crystallization window but has a minor effect on the molecular chain diffusion time. The crystallinity reaches its maximum at a carbon fiber content of 40 wt.%, reaching 55.16%. The steady-state rheological behavior reveals that CF/PA6 behaves as a pseudoplastic fluid, exhibiting shear-thinning behavior. When the carbon fiber content is 40 wt.%, the power law exponent (n) reaches its maximum, and the consistency coefficient (K) decreases by 300 $\mathrm{Pa}\cdot {\mathrm{s}}^{\mathrm{n}}$ compared to the 30 wt.% content. With increasing temperature, n increases while K decreases. SEM observations reveal that samples with carbon fiber contents of 20 wt.% and 40 wt.% exhibit better fiber dispersion and orientation. However, the interfacial bonding strength is superior in the 40 wt.% sample. When the carbon fiber content reaches 50 wt.%, significant injection molding defects occur at the clamping end, leading to extensive matrix tearing during tension testing.

Silver nanowire (AgNW) networks have excellent optoelectronic properties and have important applications in various optoelectronic devices. However, the random distribution of AgNWs coated on the substrate will cause problems such as uneven resistance and high surface roughness, which will affect the properties of the film. In order to solve these problems, this paper adopts the method of directional arrangement of AgNWs to prepare conductive films, by mixing AgNW aqueous solution with hydroxypropyl methyl cellulose (HPMC) to prepare conductive ink, and then the AgNWs are oriented on the flexible substrate by using the shear force generated during the Mayer rod coating process. The multilayer crossed three-dimensional (3D) AgNW conductive network is prepared, achieving a sheet resistance of 12.9 Ω sq⁻¹ and a transmittance of 92.2% (λ = 550 nm). In addition, the roughness RMS value of the layered and ordered AgNW/HPMC composite film is only 6.96 nm, which is much lower than that of the randomly arranged AgNW film (RMS = 19.8 nm), and the composite film also has excellent bending resistance and environmental stability. This adjustable coating method is simple to prepare and can realize the large-scale manufacturing of conductive films, which is important for the future development of flexible transparent conductive films.

Currently, electromagnetic shielding materials need to meet the characteristics of lightweight, high transmittance, and robust conductivity.