High‐performance electromagnetic interference shielding material based on an effective mixing protocol

Abstract

A facile and economic method is developed for the fabrication of new lightweight materials with high electromagnetic interference (EMI) shielding performance, good mechanical properties and low electrical percolation threshold through melt mixing. Electrical properties, DC conductivity, EMI shielding performance and mechanical properties of poly(trimethylene terephthalate) (PTT)/multiwalled carbon nanotube (MWCNT) nanocomposites with varying filler loading of MWCNTs were investigated. High‐resolution transmission electron microscopy was used to determine the distribution of MWCNTs in the PTT matrix. The newly developed nanocomposites show excellent dielectric and EMI shielding properties. Theoretical electrical percolation threshold was achieved at 0.21 wt% loading of MWCNTs, due to the high aspect ratio and the three‐dimensional network formation of MWCNTs. Experimental DC conductivity values were compared with those of theoretical models such as the Voet, Bueche and Scarisbrick models, which showed good agreement. The PTT/3% MWCNT composite showed an EMI shielding value of ∼38 dB (99.99% attenuation) with a sample thickness of 2 mm. Power balance was used to determine the actual contribution of reflection, absorption and transmission loss to the total EMI shielding value. The nanocomposites showed good tensile and impact properties and the composite with 2% MWCNTs exhibited an improvement in tensile strength of as much as 96%. © 2018 Society of Chemical Industry

Predictive Optimization of Electrical Conductivity of Polycarbonate Composites at Different Concentrations of Carbon Nanotubes: A Valorization of Conductive Nanocomposite Theoretical Models

“…This increment in electrical conductivity is suddenly raised for , confirming the formation of a percolative three-dimensional network; this increase is more pronounced in the range . Extra addition of CNT filler has shown low to marginal increase in the conductivity of PC-CNT composite [ 31 ]. This model is not favorable to be applied in our study, because our composite does not follow electron diffusion theory, relying on electron emission in the studied range of CNTs loading due to the interconnected CNTs pathways; when taking into account the first data point where the composite is not reinforced by CNT (pristine PC, 0.0 vol.%), a straight line cannot be obtained.…”

Regenerable and Ultraflexible Sustainable Film Derived from Tree Gum Kondagogu for High-Performance Electromagnetic Interference Shielding

“…This process involves the adsorption of positively charged surfactant onto the surface of MWCNTs. Then, sonication of the solution dispersed the nanotube aggregates into a fine dispersion via steric and electrostatic repulsions 38 (Figure S1). While preparing the nanocomposite solution, the noncovalently functionalized MWCNT were uniformly dispersed into the KS conjugate.…”

Effects of carbon nanotubes and interphase properties on the interfacial conductivity and electrical conductivity of polymer nanocomposites

“…Modeling techniques can investigate the roles of different parameters in the conductivity of nanocomposites. Recently, carbon nanomaterials such as carbon nanotubes (CNTs) [11][12][13][14][15][16][17][18] and graphene [19][20][21][22][23][24][25][26][27][28][29][30] have attracted much interest by researchers. Some models have been developed for the conductivity of polymer CNT nanocomposites (PCNTs) assuming the filler arrangement, filler agglomeration, tunneling distance and CNT waviness, [31][32][33] but some indistinct equations and parameters limit their applications in calculations.…”