Effect of Shear Rate and Temperature on the Rheological Properties of Low-Molecular-Weight Polyethylene

This study investigates the rheological properties of low-molecular-weight polyethylene (LMWPE) under different shear rates and temperatures. The rheological behavior was evaluated at shear rates ranging from 10 to 1000 s⁻¹ and temperatures from 80 to 180 °C. The results showed that dynamic viscosity decreased from 12.5 to 10.5 Pa·s with increasing shear rate, while shear stress increased from 125 to 10500 Pa. Increasing temperature from 80 to 180 °C reduced the viscosity from 18.4 to 6.5 Pa·s and increased the melt flow index from 6.5 to 20.4 g/10 min. The results characterize the flow behavior and temperature dependence of LMWPE and provide information relevant to its processing and industrial applications.

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