Fibers of Thermoplastic Copolyamides with Carbon Nanotubes for Electromagnetic Shielding Applications

Abstract

Polymer composites containing carbon nanofillers are extensively developed for electromagnetic shielding applications, where lightweight and flexible materials are required. One example of the microwave absorbers can be thermoplastic fibers fabricated from copolyamide hot melt adhesives and 7 wt % of multi-walled carbon nanotubes, as presented in this paper. A broadband dielectric spectroscopy confirmed that the addition of carbon nanotubes significantly increased microwave electrical properties of the thin (diameter about 100 μm) thermoplastic fibers. Moreover, the dielectric properties are improved for the thicker fibers, and they are almost stable at the frequency range 26–40 GHz and not dependent on the temperature. The variances in the dielectric properties of the fibers are associated with the degree of orientation of carbon nanotubes and the presence of bundles, which were examined using a high-resolution scanning microscope. Analyzing the mechanical properties of the nanocomposite fibers, as an effect of the carbon nanotubes addition, an improvement in the stiffness of the fibers was observed, together with a decrease in the fibers’ elongation and tensile strength.

Comparison of Carbon-Nanoparticle-Filled Poly(Butylene Succinate-co-Adipate) Nanocomposites for Electromagnetic Applications

“…A frequency-independent permittivity response can be seen in the 5.0–10.0 vol.% GN and 1.1–2.3 vol.% NCB samples, which correlates with their lower electrical conductivity as seen in Figure 2 and lower density of the percolated network. The achieved dielectric permittivity values are in line with values obtained in other thermoplastic carbon-nanoparticle composites in literature [ 73 ], and therefore our developed composites have the potential to be used for EMI shielding applications. Moreover, 1 mm thick plates of composites filled with 20 vol.% GN and 7.3 vol.% NCB exhibit more than 54% absorption at 25 GHz, while the microwave absorption of corresponding plate composites filled with MWCNT is slightly less than 50% [ 74 ].…”

Simulation of a Single-Electron Device Based on Endohedral Fullerene (KI)@C180

“…At present, the use of different types of carbon nanostructures in various areas of life, from the biomedical domain to solar energy, is widely known [6][7][8][9][10][11][12][13][14][15][16][17]. There are several works, both experimental [18][19][20][21] and using computer simulations [22,23], on the study of the crystallography of various alkali iodides grown in single-walled carbon nanotubes.…”