Conducting aluminum‐filled nylon 6 composites

Abstract

This work is concerned with the preparation and characterization of composite materials prepared by compression molding of a mixture of aluminum flakes and nylon 6 powder. The electrical conductivity, density, hardness and morphology of composites were investigated. The electrical conductivity of the composites is < lo-' S/cm unless the metal content reached the percolation threshold, beyond which the conductivity increased markedly by as much as loll. The volume fraction of conductive filler at the percolation threshold was calculated from experimental data, by fits to functions predicted by the percolation theory. Decreasing the average particle diameter of filler leads to increased percolation threshold (it varies from 23 to 34 vol% for the three different fillers studied] and decreased maximal conductivity of composites. The density of the composites was measured and compared with values calculated assuming different void levels within the samples. Furthermore, it is shown that for certain sizes of particle filler, the hardness decreases initially with the increase of metal concentration, possibly because of poor surface contact with the nylon matrix, but, starting from a certain value, there is a hardness increase. For the smallest particle filler, the hardness of samples is not influenced by the presence of the filler.

Conducting polymer composites of zinc‐filled urea–formaldehyde

“…The procedure used to estimate the conductivity from resistance in this study was similar to one reported earlier. 21 The density of the composites was measured in accordance with ASTM D 792-91 by the difference of weight in the air or with the sample immersed in water, as the liquid of known density, at 23°C with a Mettler Toledo (Columbus, OH) AJ 100 balance equipped with a density-determination kit.…”

Predictive Model of Graphene Based Polymer Nanocomposites: Electrical Performance

“…At first, carbon black [1,2], metallic powder [3][4][5], polyaniline [6] and graphite [7] were used as electrical reinforcement in polymer, but high concentration was necessary to achieve the percolation threshold which endangered the mechanical properties of the nanocomposites due to the formation of agglomerations. Later, several researchers proposed polymer nanocomposites reinforced with graphene nanoparticles and its derivatives (expanded graphite, graphene nanoplatelets, graphite oxide, functionalized graphene/expanded graphite), which are able to form more stable 3D conductive networks in lower volume content as a consequence of their high aspect ratio (AR-ratio of main particle dimension to minor one) [8][9][10][11][12][13][14][15].…”

Electrical conductivity of ion-doped graphite/polyethersulphone composites

“…In this study, the percolation threshold of PES/untreated and PES/treated graphite composites is lower than 3 wt% which is much lower than that of composites prepared with conventional (micro-scale) graphite [10]. The improvement in conductivity of the composites at low loading could be attributed to high aspect ratio of the graphite.…”

“…In most cases, relatively large quantities of fillers are needed to reach the critical percolation value, as the filler particle size is at micrometer scales. Too high concentration of the conductive filler could lead to materials redundancy and detrimental mechanical properties [10]. The electrical conductivity of composites, filled with micron sized carbon fibres, with the lowest aspect ratio (10) loaded as high as 60 wt% was the similar as compared to 10wt% of the one with highest aspect ratio (300) [2][3][4][5][6].…”