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Rotational rheometry is a powerful technique for the measurement of complex shear rheology across all material types – sensitive enough to measure the viscosity of dilute polymer solutions, and yet robust enough to measure the viscoelasticity of high modulus polymers or composites. Rotational rheometry is ideal for discerning structural and compositional changes of materials, which can be critical controlling factors in flow and deformation properties, and ultimately product stability and performance.
The basics of the rotational rheometry technique are as follows:
Rotational rheometry also enables other rheological properties to be evaluated, including yield stress, thixotropy, creep and recovery and stress relaxation.
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The Kreiger-Dougherty model describes the effect of the dispersed phase properties on suspension viscosity. This note discusses how the relevant fitting parameters can be determined for use with this model.
Many products are packaged in tubes or bottles and must be pumped through a nozzle. This application note shows how stress requirements for pumping and recovery following extrusion can be determined.
orm-like micelles have widespread use across a range of industries. This application note shows how it is possible to extract key microstructural information about these systems using rotational rheometry.
When making rheological measurements on structured liquids possible errors may be introduced due to a phenomenon called ‘wall slip. This application note shows how the extent of wall slip can be determined.
Many complex fluids exhibit solid-like properties at rest, and only flow when a critical stress is exceeded. This Application Note reviews the shear stress sweep test for yield stress measurement.
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