Influence of aluminum nanoparticle surface treatment on the electrical properties of polyethylene composites

Abstract

In this study, we investigated the influence of the surface treatment of Al nanoparticles on the electrical properties of linear low density polyethylene composites. Octyl-trimethoxysilane was used as a nonpolar silane coupling agent for the surface treatment of Al nanoparticles. It was found that the incorporation of nonpolar octyl groups onto the surface of Al nanoparticles not only increased the percolation threshold and the resistivity but also improved the dielectric properties as compared to the composites filled with unsurface-treated nanoparticles. The surface treatment makes it possible to easily control the frequency and concentration dependences of dielectric constant and provided an excellent approach able to considerably reduce the dielectric loss of the nanocomposites, which is of great significance from the viewpoint of practical application of the polymer/metal nanocomposites in the electrical and electronic industries. It is concluded that the improved electrical properties could be directly ascribed to the good dispersion and special electrical feature of the surface-treated nanoparticles in the polymer matrix.

Polyethylene/aluminum nanocomposites: Improvement of dielectric strength by nanoparticle surface modification

“…Detailed chemical characterization of coated nanoparticle surfaces was described in elsewhere. 7,10 It has been found that $ 1 wt % of OTMS silane coupling agent covalently bonded to the Al surface and that the surfaces of the OTMS coated nanoparticles were more hydrophobic when compared with the surfaces of the as received nanoparticles because of the introduction of non-polar octyl groups on the surfaces. The schematic of surface characteristics for a silane treated Al nanoparticle is presented in Figure 4.…”

Comparative investigation on dielectric property and thermal conductivity of in situ polymerized and solution mixed polymer nanocoposites

“…Materials with high dielectric constant are expected to play increasingly important roles in many applications such as electric stress control [1], electric energy storage [2] and actuators [3]. Compared with inorganic ceramics, high dielectric constant polymer nanocomposites have attracted ever-increasing attention due to their easy-processing and low cost.…”

Enhanced thermal conductivity and dielectric properties of Al/β-SiCw/PVDF composites

“…One classic approach is to introduce either high dielectric constant ceramic particles (i.e., Barium titanate, Cadmium oxide, Tungstic oxide) [6,10,[11][12][13][14][15][16] or high electric conductivity particles such as metal (i.e., Aurum, Silver, Copper, Aluminum) [2,[17][18][19][20][21][22][23] and carbon fillers [24][25][26][27][28][29][30] into a polymer. To date, two technical routes have been developed to achieve high dielectric constants polymer composites, i.e., the preparation of percolative composites and ceramic/polymer composites [5].…”