Lightweight poly(vinylidene fluoride) based quaternary nanocomposite foams with efficient and tailorable electromagnetic interference shielding properties

Abstract

Driven by rapidly growing demands in fields such as mobile electronics, aerospace and military, the need for functional materials with lightweight, good environmental stability and efficient electromagnetic interference (EMI) shielding properties has rose sharply. In this paper, quaternary nanocomposite foams comprising of poly(vinylidene fluoride) (PVDF), carbon nanotubes (CNTs), graphene nanoplatelets (GNPs) and Ni were developed by a melt blending and supercritical CO2 foaming technology. Compared with pure PVDF, the crystallization temperature of PVDF/2CNTs/2GNPs/12Ni nanocomposite increased remarkably from 139.0 to 144.9°C. Rising the nanofiller loading from 0 to 16 wt% led to the enhancements of around four orders of magnitude in the storage modulus of PVDF nanocomposites as well as about three orders of magnitude in their complex viscosity. For a typical PVDF/2CNTs/2GNPs/12Ni nanocomposite, its EMI shielding effectiveness reached 32.2 dB, brought by dielectric loss and magnetic loss. The electrical conductivity and EMI shielding effectiveness of PVDF nanocomposite foam achieved the optimum values of 0.84 S/m and 19.4 dB, respectively, which originated from the introduction of pore structure and the gradual generation of nanofiller‐nanofiller conductive networks. This study took a promising way toward the fabrication of materials with adjustable EMI shielding property in the fields of electronics and aerospace industries.

Designing improved electromagnetic shielding efficacy of poly(3‐hydroxybutyrate‐co‐3hydroxyvalerate) nanocomposites foam using carbon nanotubes and graphene nanoplatelets

“…The ε of PHBV nanocomposites with different proportions of CNTs and GNPs is depicted in Figure 6, which could provide some information for exploring the EMI shielding mechanism of diverse PHBV specimens. Their ε could be expressed using the Equation 4 as follows 54 : …”

Recent advances in structural design of conductive polymer composites for electromagnetic interference shielding

“…Polymer foaming has been proven an effective method for fabricating lightweight EMI shielding polymer composites 224–233 . For example, Cai et al 233 prepared closed‐cell foams with an adjustable EMI shielding response by incorporating temperature‐sensitive microspheres (TSM) into a mixture of PDMS and CNTs.…”

“…Polymer foaming has been proven an effective method for fabricating lightweight EMI shielding polymer composites. [224][225][226][227][228][229][230][231][232][233] For example, Cai et al 233 prepared closed-cell foams with an adjustable EMI shielding response by incorporating temperature-sensitive microspheres (TSM) into a mixture of PDMS and CNTs. The EMI shielding performance under varied temperatures and compressive strains of PDMS/TSM/CNTs composites was investigated, and the corresponding regulatory mechanism on EMI shielding was explored.…”

Fabrication of Multiwalled Carbon Nanotubes (MWCNT) and Reduced Graphene Oxide (rGO)‐based thermoplastic polyurethane and polypyrrole nanocomposites for electromagnetic wave absorption application with a low reflection

“…Nowadays, it is impossible for a person to conceive of living their life without using an electronic device or communication tool that typically operates in the radio or microwave spectrum. 1 As a result, in this current world, EMR pollution is becoming the fourth pollution after water, air, and noise pollution due to a rise in the multitude of electronic devices. 2 Thus, much study has been done to mitigate the adverse effects of EMR and EM interference (EMI) pollution.…”