Enhanced impact resistance and electromagnetic interference shielding of carbon nanotubes films composites

Abstract

High reliability and high-performance electromagnetic interference (EMI) shielding polymeric composite was fabricated by introducing carbon nanotube films (CNT f) into an epoxy (EP) matrix as mechanical and EMI shielding reinforcement simultaneously. According to the computed tomography (CT) detection recorded by a high-speed camera, CNT f exhibited excellent mechanical behavior and good energy absorption. While being introduced into laminated EP composite, the CNT f enhanced both the mechanical performance and EMI shielding performance. The damage mechanism of CNT f /EP was studied by CT detection of the impact process, indicating that the CNT f absorbed the impact energy by improving the delamination resistance. Additionally, the multilayered CNT f can trap and attenuate the entered electromagnetic microwaves by repeated adsorption, reflection, and scattering in the composite, resulting in excellent EMI shielding performance. Consequently, the energy absorption and the total shielding effectiveness of the CNT f /EP reached to 4.58 × 10 −3 J and 52.31 dB, respectively. Therefore, we demonstrated that the CNT f was an ideal functional reinforcement for mechanically strong and high-performance EMI shielding polymeric composites and the CNT f reinforced EP composite is promising in practical EMI-shielding applications.

Tensile Stress-Gated Electromagnetic Interference Shielding Fabrics with Real-Time Adjustable Shielding Efficiency

“…Also, the multiple reflections are considered to be the scattering effect induced by unevenness inside the material, and when the total shielding effectiveness (SE) > 15 dB, the multiple reflection shielding effectiveness is usually negligible. Therefore, the total SE (SE T ), the absorption SE (SE A ), and the reflection SE (SE R ) could satisfy the following formula …”

Recent Advances in Polymer Nanocomposites for Electromagnetic Interference Shielding: A Review

“…Hui et al in 2020 synthesized CNT film (CNT f ) reinforced epoxy (EP) multilayer composites with good impact resistance behavior and EMI shielding efficiency. 106 A SE of 52.31 dB in the X-band was attained by introducing a three-layer CNT f into the interlayer of EP plates. EM waves entering the multilayered CNT f encountered sufficient attenuation through repeated reflection, adsorption, and scattering.…”

Electromagnetic interference cognizance and potential of advanced polymer composites toward electromagnetic interference shielding: A review

“…The structural and morphological impact on the performance can be observed from a polymer composite of CNT f and an epoxy matrix, where multilayered CNT films and epoxy layers trapped and attenuated the incident EMWs by absorption and multiple reflections, with a shielding effectiveness of 52.31 dB. [114] In another layered morphology, shown in Figure 7, CNTs with an epoxy matrix in a three-layered structure exhibited excellent shielding performance (52.31 dB) and energy absorption (4.58 Â 10 À3 J). [114] An experiment to synthesize a polymer composite using an environmentally friendly and scalable method was carried out, where a conductive textile was formed by the coating of cross-linked single-walled CNTs (SECNTs) and a biomass-derived glucaric acid chitosan organic aqueous solution using drop-casting, dip, and spray coating, as depicted in Figure 8.…”

“…[114] In another layered morphology, shown in Figure 7, CNTs with an epoxy matrix in a three-layered structure exhibited excellent shielding performance (52.31 dB) and energy absorption (4.58 Â 10 À3 J). [114] An experiment to synthesize a polymer composite using an environmentally friendly and scalable method was carried out, where a conductive textile was formed by the coating of cross-linked single-walled CNTs (SECNTs) and a biomass-derived glucaric acid chitosan organic aqueous solution using drop-casting, dip, and spray coating, as depicted in Figure 8. [115] The conductive textile showed a high electrical conductivity of 7.4 Â 10 2 S/m and a Sea shielding effectiveness of 30 dB in the X-band.…”