Morphology and electrical properties of carbon black filled LLDPE/EMA composites

Abstract

The morphology and electrical properties of linear low density polyethylene (LLDPE)/poly (ethylenemethyl arylate) (EMA) blends filled with carbon black (CB) are investigated in this work. Comparing to LLDPE/CB composite, the higher percolation threshold of EMA/CB composite is attributed to the good interaction between EMA and CB. However, carbon black is found to locate preferentially in the LLDPE phase of LLDPE/EMA immiscible blends from the characterization of SEM and electrical properties, which greatly decreases the percolation threshold of the composites. The viscosity of the two polymers is the key factor to determine the distribution of CB instead of interfacial energy in this system. This suggests a method to control the distribution of CB in the immiscible blends by choosing the viscosity ratio of polymer blend.

Structure and linear viscoelasticity of polymer nanocomposites with agglomerated particles

“…Attractive interaction between particles is very common in polymer nanocomposites, which may result in agglomeration of particles, and the smaller the particle size, the more evident the agglomeration. Actually, agglomeration has been observed in various systems, including nanosilica in styrenebutadiene rubber [6,7], polystyrene [8,9], polypropylene [10], poly(methyl methacrylate) [11], poly(ethylene oxide) [12,13], polyolefin elastomer [14e16], and carbon black in polyethylene [17,18], polypropylene [19,20], polystyrene [21], poly(methyl methacrylate) [22,23]. The agglomeration of NPs is not limited for the spherical shape, and it is also observed for fibrous particles [24e26].…”

The Electrical Conductivity of Graphite Nanoplatelet Filled Conjugated Polyacrylonitrile

“…The first entails a conductive particulate filler such as metallic powders, [1] carbon black, [2] carbon nanotubes (CNT), [3] and graphite nanoplatelets (GNPs), [4] wherein significant conductivity is achieved beyond a critical particle concentration at which percolation is attained. The second is based, by and large, on a conjugated p-electron system in a semi-conductive polymer, which upon doping results in either electron ejection from or electron acceptance by the polymer, and exhibits intrinsic conductivity produced by mobility along the chain of either positive charge 'holes' or electrons, respectively.…”

Heterogeneous distribution of magnetic nanoparticles in reactive polymer blends

“…2, is higher than that of PA6 in the entire shear frequency range (0.1-100 rad/ s) at the compounding temperature. According to the previous reports [18,19], nanoparticles prefer to disperse in a polymer phase with a lower viscosity. Fig.…”

“…Viscosity and particle migration in the polymer melts should be taken into account. Persson et al [18] and Zhou et al [19] pointed out that viscous distribution effects dominate only when the difference between interactions with polymer and filler is small; in this case, the particles may accumulate in a lower viscous phase because the blend organizes itself to minimize its dissipative energy during mixing. Depending on the order of mixing, filler may have to transfer from one phase to the other in order to reach its equilibrium distribution [20].…”