Carbon black‐filled immiscible polypropylene/epoxy blends

Abstract

Carbon black-(CB) filled immiscible thermoplastic/thermosetting polymer blends consisting of polypropylene (PP) and epoxy resin were reported in this paper. The PP/epoxy/CB blends with varied compositions and different processing sequences were prepared by meltmixing method. The CB distribution and the relationship between morphology and electrical properties of the PP/ epoxy/CB blends were investigated. Scanning electron microscopy (SEM), optical microscopy, and extraction experimental results showed that in PP/epoxy blends CB particles preferentially localized in the epoxy phase, indicating that CB has a good affinity with epoxy resin. The incorporation of CB changed the spherical particles of the dispersed epoxy phase into elongated structure. With increasing epoxy content, the elongation deformation of epoxy phase became more obvious and eventually the blends developed into cocontinuous structure. When CB was initially blended with PP and followed by the addition of epoxy resin, the partial migration of CB from PP to the epoxy phase was observed. When the PP/epoxy ratio was 40/60, the percolation threshold was reduced to about 4 phr CB, which is half of the percolation threshold of the PP/CB composite.

Some Studies on HAF Reinforced Epoxy Composites

“…As indicated from Figure 2, the values of " 0 and " 00 for epoxy resin composites in the presence of 10 wt% Mg(OH) 2 show a similar trend as in Figure 1. In order to make a comparison, the permittivity " 0 as a function of HAF content at f ¼ 100 Hz before and after the addition of 10 wt% Mg(OH) 2 is illustrated graphically in Figure 3.…”

High-performance conductive materials based on the selective location of carbon black in poly(ether ether ketone)/polyimide matrix

“…The reduction of percolation threshold in the double percolation system could be explained by the difference in the affinity of CB to the polymer components, which results in the CB selectively located in one of the two polymer phases. Li et al reported that PP/epoxy/CB composites exhibited a highly inregular morphology in which CB was selectively distributed in the epoxy phase [25]. The ternary PP/epoxy/CB composites showed reduced percolation threshold compared with binary CB composites, which was attributed to the double percolation effect.…”

“…While selective location of CB in immiscible polymer blends is one of the most promising methods to reduce the percolation threshold and enhance the electrical conductivity [25]. Low CB loading means relatively low melt viscosity and improved impact resistance, as well as low cost to the final commercial products.…”

Surface modification of carbon black for the reinforcement of polycarbonate/acrylonitrile–butadiene–styrene blends

“…Carbon black (CB) has been considered as an ideal filler for polymer composites due to its outstanding mechanical [6][7][8], electrical [9][10][11] and thermal properties [12]. As far as the practical applications of CB are concerned, it has been proven that the incorporation of CB into polymers is a simple and effective method to improve the mechanical and thermal properties of polymers [13][14][15].…”