Influence of annealing on linear viscoelasticity of carbon black filled polystyrene and low-density polyethylene

The role of conductive pathways in the conductivity and rheological behavior of poly(methyl methacrylate)–graphite composites

“…These results indicate that the conductive network of the composites is less related to the interaction between PMMA molecules and graphite particles. Meanwhile, our results confirm that the movement of graphite particles is more difficult than that of 1D particles in a polymer matrix, which is in good agreement with the small variation of activation energy values of conductive network formation and our speculation. The main reason can be attributed to the different geometries of the particles.…”

Rheological and electrical properties of carbon black‐based poly(vinylidene fluoride) composites

“…The fitting approaches were reported elsewhere in detail []. It is clear that strain amplification factor cannot be well described by Huber‐Vilgis function at higher CB loadings, which has also been reported on many other polymer composite systems with high CB loading levels []. This is reasonable because the constant C in Huber‐Vilgis function is based on the final dispersion and distribution of filler, and it is not a constant any more at the high loadings because of percolation or aggregation of filler.…”

“…Clearly, the linear dynamic viscoelastic response of PVDF composite systems highly depends on the formation and evolution of mesoscopic CB network structures. A two‐phase model proposed by Song et al [], which can be used to describe the dynamic rheological responses of filled polymeric systems, is hence used here to further explore the role of CB during SAOS flow. Generally, the presence of hard and much less deformable filler inclusions in a soft and highly deformable polymer matrix leads to hydrodynamic effects referring to a strain amplification factor []: where and are the frequency and filler concentration (wt%), respectively, and is complex modulus of the unfilled polymer.…”

Influence of annealing time on linear rheology and morphology of silica filled polyisoprene rubber and ethylene‐propylene rubber

“…Thermal treatment of nanocomposites at elevated temperatures could accelerate the structural evolution of particle aggregates, as evidenced by various methods including creep and creep‐recovery, dielectric spectroscopy, real‐time trace of electrical resistivity, nuclear magnetic resonance, and dynamic rheology . The annealing‐induced structural evolution involving in aggregation of filler clusters with a constant fractal dimension results in variation of viscoelasticity of composites and the aggregation process is revealed to follow the first‐order kinetics in connection to diffusion of small isolated aggregates toward pre‐existing large aggregates in polymer melts. Carbon black filled rubber compounds are usually chosen to explore structural evolution during annealing and measurement of electrical conductivity is helpful for evaluating the aggregation process.…”