Measuring rheological properties of polymer with torque-rheometer
A temperature corrected equation is developed to measure rheological parameters of the crystalline and amorphous polymer in torque rheometer,and rheological results were compared with capillary rheometer results.The results showed that the activity energy and flow index data measured with torque rheometer were in good accordance with those measured with capillary rheometer.When measuring the rheological parameters,the torque values measured should be corrected for the temperature rise due to viscous dissipation.Equivalent radius was a quantity depending only on geometrical dimensions of the mixer but independent of the nature of the fluid and the mixing conditions.Torque rheometer has a narrow range of shear rate.