Melt rheological properties of ethylene-vinyl acetate/multi-walled carbon nanotube composites

Investigation of the microwave attenuation performance and structure‐property relationship for graphite‐filled cyclo‐olefin copolymer composites

“…Such that, G‐75 had the highest viscosity up to the shear rate of 1 s −1 , while it had almost the same viscosity value as COC at higher shear rates. To asses a deeper analysis for the viscosity‐shear rate behavior of the samples, experimental viscosity values were modeled by the Cross model [ 50,51 ] that describes the entire viscosity curve, from Newtonian to shear‐thinning regions, including the transition zone. The mathematical description of the Cross model as a function of the shear rate is given in Equation ): where η 0 is the zero‐shear rate viscosity, γ is the shear rate, τ * (Pa) is a constant that shows the shear stress value from which the pseudo‐plastic (shear thinning) behavior of the polymer start, and n is the power‐law coefficient that symbolizes the slope of the shear‐thinning region of the material as (1 − n ).…”

Critical Powder Loading and the Rheology of Nanosized Cemented Carbide with Titanium Carbide as Grain Growth Inhibitor for Injection Molding

“…Sudden viscosity change will happen with any small fluctuation of temperature during molding if the viscosity is very sensitive to the temperature variation. The sensitivity of shear viscosity to temperature has implication on the choice of processing conditions as well as on the quality of the final product [23].…”

Experimental Investigation of the Melt Shear Viscosity, Specific Volume and Thermal Conductivity of Low-Density Polyethylene/Multi-Walled Carbon Nanotube Composites Using Capillary Flow

“…Specifically, for polymer/CNT composites, melt rheology can be used to assess, in a systematic way, the state of CNTs in polymers (e.g., dispersion, agglomeration and adhesion) after melt processing, which links to the mechanical and electrical properties of the final products [ 1 , 3 , 5 , 9 , 10 , 11 , 13 , 15 , 18 , 21 , 22 , 24 , 25 , 39 ]. Moreover, melt rheology is an important tool for understanding how CNTs affect the processing behavior of polymer/CNT composites [ 3 , 5 , 11 , 14 , 15 , 18 , 39 , 40 , 41 ].…”

“…Although considerable research has been conducted regarding the material properties of polymer/CNT composites, including mechanical, thermal and electrical properties, only a few investigations have focused on the high shear rate rheological behavior [ 10 , 11 , 13 , 15 , 18 , 25 , 39 , 40 , 41 , 42 , 43 ]. Usually, the rheological properties have been measured by parallel plates or con-plates using dynamic oscillation frequency sweeps under linear viscoelastic conditions and shear rates in the range of 0.01 to 100 s −1 [ 1 , 9 , 14 , 19 , 21 , 22 , 24 , 26 , 44 ].…”

“…Rheological studies on polymer/CNT composites have revealed that the incorporation of CNTs into a polymer matrix brings significant changes in the melt viscosity, which in addition to the temperature and shear rate is affected by the CNT features (type, aspect ratio, loading, and state of dispersion) [ 1 , 3 , 10 , 11 , 13 , 15 , 18 , 24 , 25 , 39 , 40 , 41 , 42 , 43 ]. Specifically, it was reported that the viscosity of polymer/CNT composites usually increases with increasing CNT loading and, at high shear rates, exhibits shear thinning behavior [ 11 , 13 , 15 , 18 , 25 , 40 , 41 , 42 , 43 ].…”