8/22/2023 0 Comments How to test slip viscosity![]() Further, time–temperature superposition master curves of the magnitude of the complex viscosity and steady-state shear viscosity obtained by CCR were developed for LLDPE and PBD. ![]() ![]() Measurements of the magnitude of the complex viscosity ∣ η ⁎ ( ω ) ∣ were compared with the steady-state shear viscosity data obtained by capillary rheometer and CCR. To verify the method and the accuracy of the CCR data, three commercial polyolefin polymers, a low-density polyethylene (LDPE), a linear low-density polyethylene (LLDPE), and a polybutadiene (PBD), were used as model systems. A new method, the so-called ramp test, is investigated in this study to obtain the steady-state shear viscosity with a closed cavity rheometer (CCR). The steady-state shear viscosity η ( γ ̇ ) is required in controlling processing parameters for the extrusion processing of polymer melts.
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