Search

The development of flexible electronics has placed higher demands on electromagnetic interference (EMI) shielding materials, especially in terms of mechanical properties. Herein, a novel composite with excellent mechanical and EMI shielding properties was developed. The electrohydrodynamic atomization deposition approach was used to deposit Ti 3 C 2 T x MXene and graphene oxide (GO) nanosheets on carbon fiber fabric (CFf) surface, then they were assembled layer by layer with thermoplastic polyurethane (TPU) and thermoformed at high temperature to obtain MG/f-CFf/TPU composite. When the MXene/GO content increases, the mechanical performance of the composite is improved, mainly owing to the formation of chemical bonds and the presence of mechanical interlocking and van der Waals forces. Specifically, the tensile strength and interlaminar shear strength of the composite reach 140.98 MPa and 54.67 MPa, increasing by 72.45 % and 52.92 %, respectively. Benefitting from the unique lamellar structure, the maximum EMI-SE of MG/f-CFf/TPU composite is 38.29 dB. Besides, the MG/f-CFf/TPU composite also displays outstanding EMI-SE stability after 3000 times folding cycles. The flexible MG/f-CFf/TPU composite may provide more guidelines for the design of next-generation flexible EMI shielding materials. [Display omitted] • The mechanical and EMI shielding properties are improved by adding MXene/GO hybrids. • The tensile strength and ILSS of the composite are 140.98 MPa and 54.67 MPa, respectively. • The composite shows a superior EMI shielding effectiveness of 38.29 dB. • The composite displays outstanding flexibility and EMI-SE stability. [ABSTRACT FROM AUTHOR]

Electromagnetic shielding materials play a significant role in solving the increasing environmental problem of electromagnetic pollutions. The commonly used metal‐based electromagnetic materials suffer from high density, poor corrosion resistance, and high processing cost. Polymer composites exhibit unique combined properties of lightweight, good shock absorption, and corrosion resistance. In this study, a novel high angle sensitive composite is fabricated by combining carbon fiber (CF) fabric with thermoplastic polyurethane elastomer (TPU). The effect of stacking angle of CF fabric on EMI shielding performance of composite is studied. When the stacking angle of CF fabric changed, the electromagnetic interference (EMI) shielding effectiveness (SE) of CF fabric/TPU composite can reach a maximum of 73 dB, and the tensile strength can reach 168 MPa. In addition, the composite has anisotropic conductivity, which is conductive along the plane direction and nonconductive along the thickness direction. Moreover, the CF fabric/TPU composite manifests exceptional EMI‐SE/density/thickness value of 383 dB cm2 g−1, which is higher than most of current EMI shielding composites reported in literature. In summary, CF fabric/TPU composite is an excellent EMI shielding material that is lightweight, highly flexible, and mechanically robust, which can be applied to the field of aerospace and some intelligent electronic devices. [ABSTRACT FROM AUTHOR]

Nowadays, it is quite difficult to develop a facile, efficient, and easy large-scale production method to obtain the composite that can maintain a balance of Electromagnetic interference (EMI) shielding properties and mechanical properties. Herein, this work adopted the technology of electrohydrodynamic atomization deposition (EHDAD), layer-by-layer (LbL) assembly and heat-pressing to prepare carbon fiber fabric/graphene oxide/Fe 3 O 4 /epoxy (CFf/GO/Fe 3 O 4 /epoxy) composite. The research results show that the CFf/GO/Fe 3 O 4 /epoxy composite can maintain a good balance between mechanical and EMI performance. More specifically, the tensile strength of CFf/GO/Fe 3 O 4 /epoxy-4 composite can reach 565.1 MPa, which is higher than that of other composites reported previously. This can be attributed to the synergistic effect of covalent bonds and van der Waals forces improved the mechanical properties of the composite. Benefitting from the unique multi-layer structure and the synergistic effect of nanoparticles, the EMI shielding performance of CFf/GO/Fe 3 O 4 /epoxy composite can reach a maximum of 32.9 dB. The improvement of the EMI properties of composite was mainly attributed to the dielectric loss and magnetic loss. Surprisingly, the composite has excellent mechanical stability and EMI shielding stability even after long periods of storage. It is believed that this work opens up more possibilities to provide EMI shielding materials with outstanding mechanical properties. [Display omitted] • The facile, efficient and easy large-scale production method was adopted to fabricate carbon fiber fabric/graphene oxide/Fe 3 O 4 /epoxy composites. • The EMI shielding effectiveness of the multilayer-structured composite can achieve 32.9 dB, which can meet commercial applications. • The mechanical property of the composite was improved to 565.1 MPa owing to the synergistic effect of covalent bond and van der Waals force. [ABSTRACT FROM AUTHOR]

[Display omitted] • The composite was prepared by electrohydrodynamic atomization deposition, layer-by-layer stacking and hot pressing technology. • The synergistic strengthening effect of van der Waals forces and covalent bonds improved the tensile strength of the composite. • The composite showed outstanding resistance stability, flexibility and electromagnetic interference shielding stability. It is a challenge to design Ti 3 C 2 T x MXene-based electromagnetic interference (EMI) shielding composites with excellent mechanical properties. Herein, a highly robust, flexible and durable Ti 3 C 2 T x MXene/carbon fiber fabric/thermoplastic polyurethanes (Ti 3 C 2 T x MXene/CFf/TPU) composite was fabricated through simple electrohydrodynamic atomization deposition, layer-by-layer stacking and hot pressing technology. The synergistic strengthening effect of van der Waals forces and covalent bonds can improve the tensile strength of the composite up to170.2 MPa, which is far greater than that of other MXene-based composites previously reported. In addition, the EMI shielding performance of the Ti 3 C 2 T x MXene/CFf/TPU composite also improved with increasing MXene mass fraction, reaching 40.4 dB, which can be attributed to the dielectric loss provided by conductive fillers and the enhanced absorption within the sandwich structure. More interestingly, the composite retained excellent resistance stability, EMI-SE stability and flexibility, even after multiple bending and releasing cycles. This work provides a facile and environmentally-friendly method for preparing composites with excellent EMI shielding properties and mechanical properties, which may provide more possibilities for applications in intelligent wear and electronic wireless communication equipment. [ABSTRACT FROM AUTHOR]