Electrical, thermal and rheological properties of low-density polyethylene/ethylene vinyl acetate/graphene-like composite

Abstract

Composites of low-density polyethylene (LDPE), ethylene vinyl acetate (EVA), and a graphene-like material were explored for their electrical properties for use in high-volume lowcost conductive applications. A graphene-like material, obtained from hybrid clay-sucrose carbonization, was investigated as an alternative filler with advantages over conventional graphene technology. The electrical properties of the composites as synthesized by the solvent-casting technique were studied using broadband dielectric spectroscopy. The percolation threshold was identified for both as synthesized and annealed composite samples. Due to charge transport and electrode polarization, the sub-percolating composites exhibited low frequency dispersion particularly at elevated temperatures. Composites of LDPE/EVA/graphene-like above the percolation threshold exhibited a higher rheological storage modulus and thermal stability which indicates an alignment between the electrical, thermal and rheological properties.

Effect of graphene on thermal stability and mechanical properties of ethylene-vinyl acetate: a molecular dynamics simulation

“…Figure 2(a) shows the orthogonal model structure of three EVA chains in the primal unit cell (27.66×27.66×27.66 Å 3 ), the density is 0.95 g/cm 3 . This is the same as the sample density of 0.95 g cm −3 used by Azizi et al [41] in the experimental study of graphene/EVA composites. The simulation box of EVA consisted of 9384 atoms by expanding the cell.…”

Enhancement in electrical and thermal performance of high‐temperature vulcanized silicone rubber composites for outdoor insulating applications

“…[12,22,38] The incorporation of 10 phr MFS and 2 phr graphene in silicone rubber led to an increase in dielectric constant of the composites mainly thanks to the higher dielectric constant of the fillers as well as maybe a slightly local interfacial polarization on the surface of the inclusions. [3,12,39,40] Loading of MFS and MFS/G did not result in any significant alteration of the dielectric loss of the composites. The addition of TiO 2 to the S rubber was resulted in a higher dielectric constant due to significant higher permittivity of TiO 2 (approximately 110) with respect to the silicone rubber (3.1), [41] as well as a significant charge accumulation at the surface boundaries of the TiO 2 particles (interfacial polarization) which can be enhanced by possible moisture absorption by the filler.…”

Efeito do ácido esteárico em scaffolds de alumina obtidos por manufatura aditiva usando o método de fabricação por filamento fundido

“…Embora os polímeros acrilonitrila butadieno estireno (ABS) e ácido polilático (PLA) sejam os filamentos mais comuns, o uso de precursores cerâmicos para a impressão 3D por FFF ainda é um desafio [9,11,12]. Outro polímero que poderia ser utilizado é o polietileno de baixa densidade (PEBD), que é caracterizado por apresentar propriedades particulares de grande interesse devido à ampla gama de aplicações e fácil processabilidade, além do baixo custo, que o torna uma alternativa de substituição para materiais com custo elevado no processo de manufatura aditiva [13,14]. Um dos pontos cruciais que determinam o sucesso do processo são as propriedades do filamento.…”