A new high-temperature capillary viscometer for measuring the viscosity of dilute polymer solutions has been designed, constructed, and extensively tested. The viscometer has combined several valuable capabilities: high-temperature operation (potentially to 280 °C and tested up to 250 °C), high precision (∼10−3 s with a temperature control of ±0.001 °C), variable shear rates (by changing the orientation of the capillary), and differential measurements (by using a twin viscometer arrangement). A description of the high-temperature viscometer and tests of its capabilities are presented.
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