Enhancing the EMI shielding of natural rubber-based supercritical CO₂ foams by exploiting their porous morphology and CNT segregated networks

Abstract

The specific shielding effectiveness of segregated CNT/rubber foams fabricated by the supercritical CO2 method reaches 312.69 dB cm2 g−1.

Electric Heating Behavior of Reduced Oxide Graphene/Carbon Nanotube/Natural Rubber Composites with Macro-Porous Structure and Segregated Filler Network

“…On the contrary, the electrical conductivity of CPCs with segregated filler network decreases after foaming because of the formation of a discontinuous segregated network, even at low foaming degrees. Some authors of this work noted that the conductivity of CNT/NR composites with a segregated network were 0.26 S m −1 and 4.90 × 10 −4 S m −1 before and after the foaming process, respectively [ 31 ]. In order to address the decreasing electrical conductivity of composites with a segregated network, Wang et al [ 32 ] first prepared porous polylactic acid beads by supercritical CO 2 and then wrapped CNT upon the porous beads in order to construct a segregated CNT network after the steam-chest molding process.…”

Highly Deformable Porous Electromagnetic Wave Absorber Based on Ethylene–Propylene–Diene Monomer/Multiwall Carbon Nanotube Nanocomposites

“…Some studies have also reported adequate EMI shielding features of rubber nanocomposite foams, in particular, natural rubber (NR) filled with multiwall carbon nanotubes (MWCNTs) [21] and silicone rubber filled with MWCNTs/ferriferous oxide (Fe 3 O 4 ) [22]. Zhan et al fabricated closed-cell NR nanocomposite foams using supercritical CO 2 and observed improved electrical, EMI shielding, and compressive properties [21]. Yang et al investigated the effect of MWCNTs/Fe 3 O 4 and reported average EM absorptions of up to 64% in the X-band [22].…”

Crack growth resistance of natural rubber reinforced with carbon nanotubes

“…To further explore the effect of CNTs on the SIC of NR, the onset extension ratio of crystallization for NR and CNTs/NR were determined from the Mooney–Rivlin plots, which can be derived from the stress–strain curves according to eq. where σ and σ* are the nominal stress and reduced stress, respectively.…”

“…The CNTs/NR composites were prepared through an ultrasonically assisted latex mixing process according to the previous report . In brief, 2 g of CNTs and emulsifier OP were mixed in distilled water under ultrasonic irradiation for 3 min.…”