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The influence of alumina (Al 2 O 3 ) content and diameter on the viscosity characteristics of the alumina/linear low-density polyethylene (Al 2 O 3 /LLDPE) composites was discussed. The composites were fabricated by melt mixing with the two-rotor continuous mixer. The equivalent surface average particle diameter (d¯A{\bar{d}}_{\text{A}}) of Al 2 O 3  was calculated by the scanning electron microscopic (SEM) images of samples. The steady-state and dynamic rheological measurements were used to study the evolution of viscosity parameters. With the Carreau model fitting to the steady-rate rheological data, zero-shear viscosity  η0 , time constant  λ , and power law index  n  of composites were obtained. On this basis, an optimized Carreau model was established by studying the changes of these parameter values. The rheological result presented that the parameter values ( η0 ,  λ , and  n ) were linearly proportional to the filling content of Al 2 O 3  particles for nano-Al 2 O 3 /LLDPE composites. However, these parameters were, respectively, related tod¯A{\bar{d}}_{\text{A}},d¯A2{\bar{d}}_{\text{A}}^{2}, andd¯A3{\bar{d}}_{\text{A}}^{3}for micron-Al 2 O 3 /LLDPE composites.

e-polymers

The optimization of Carreau model and rheological behavior of alumina/linear low-density polyethylene composites with different alumina content and diameter