Synergy effects in dielectric and thermal properties of layered ethylene vinyl acetate composites with carbon and Fe₃O₄ nanoparticles

Abstract

Properties of layered composites with carbon nanotube (CNT), GnP, Fe3O4 nanoinclusions, and hybrid composites with these nanoinclusions were investigated in the wide frequency range (from 20 Hz to 2 THz). All investigated composites (except with single Fe3O4 inclusions) are above percolation threshold. The strong enhancement of microwave and terahertz radiation absorption is observed in hybrid composites in comparison with composites with single inclusions. The synergy effect is discussed in terms of the complex impedance and the distribution of relaxation times. At low temperatures (below 200 K), the electrical conductivity of all hybrid composites follows the tunneling law model and the lowest potential barrier was estimated for composites with CNT inclusions. The best thermal properties are observed for composites with CNT inclusions. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48814.

Magnetic induced terahertz modulation characteristics based on ferromagnetic nematic liquid crystals

“…Magnetic fluid (i.e., Fe3O4 NPs), as a good MO material, has significant application prospects in THz sensing and modulation [31,32]. Chen et al [33] demonstrated the magnetically induced tunability of the in-plane refractive index of Fe3O4 NPs.…”

Electrical and Mechanical Properties of Sugarcane Bagasse Pyrolyzed Biochar Reinforced Polyvinyl Alcohol Biocomposite Films

“…For example, Poly (lactic acid), Poly (ethylene-alt-maleic anhydride) with microwave assisted biochar by Khui [16], polylactic acid with biochar nanoparticle by Sobhan et al [17], polylactic acid with activated biochar by Sobhan et al [18], epoxy with Bael shells and arhar stalk biochar by Minugu et al [19], polyvinyl alcohol with corn straw derived biochar along with silver nano particle by Zhao et al [20], polyesters with rice husk pyrolyzed biochar by Richard et al [9], polyamides with biochar by Huber et al [21], styrene-butadiene rubber (SBR) with maple wood waste derived biochar by Peterson and Kim [22], poly (vinyl alcohol) with wood biochar (PVA) by Nan et al [6], epoxy with three types of biochar (plastic waste biochar, wood shavings biochar, and pine cone char) by Ahmetli et al [23], poly (trimethylene terephthalate) (PTT) with lignin carbonized biochar by Myllytie et al [24], polypropylene with pine wood biochar by Das et al [10,11], poly (trimethylene terephthalate/poly (lactic acid) (PTT/PLA) blend with Miscanthusbased biochar by Nagarajan et al [25], polyurethane with carbon nanotube and graphite oxide particles by Gaidukovs et al [26], and ethylene vinyl acetate copolymer composite filled with carbon nanotubes to investigate electrical and mechanical characteristics by Gaidukovs et al [27]. Povilas et al [28] investigated thermal and dielectric properties of the composites prepared with carbon and Fe 3 O 4 nanoparticles and layered ethylene vinyl acetate. Minugu et al used three different loading levels (2 wt.%, 4 wt.%, and 6 wt.%) of biochar and maximum tensile strength found for the composite with 4 wt.% biochar [19].…”

THz Spectroscopy as a Versatile Tool for Filler Distribution Diagnostics in Polymer Nanocomposites

“…Multi-filler composites containing different types of fillers (including non-carbon) tend to form heterogeneous percolation networks [ 30 , 31 , 32 ]. This fact allows making composite materials without expensive fillers through the introduction of low-cost ones into the hybrid percolation network [ 33 , 34 ], or even enhancing the electromagnetic properties due to the synergistic effect [ 35 , 36 , 37 ].…”