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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:

  • The sample is loaded into the gap of a measuring system, or geometry – such as a cone and plate or a concentric cylinder system – specifically designed to impose simple shear flow when rotated.
  • The measuring system is supported by a virtually frictionless air-bearing, and driven by an ultra-low inertia motor, coupled to an ultra-high precision position encoder. The sample and measuring system are also temperature controlled.
  • Various rheological characteristics of the sample can be determined by rotating, oscillating or applying a step function to the measuring system – either by controlling motor torque (stress controlled rheometry) or position change (strain controlled rheometry).
  • Common test modes are rotational (or flow) to measure shear viscosity, and oscillation to measure dynamic material properties such as viscoelastic modulus and phase angle.

Rotational rheometry also enables other rheological properties to be evaluated, including yield stress, thixotropy, creep and recovery and stress relaxation.

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Polymer solution characterization – Part 4 Webinar - Live (English)

Polymeric materials are the most studied of all rheological materials and polymeric solutions in particular are perhaps the most interesting. They are ubiquitous in every-day life and play an important role in applications ranging from jo...

September 16 2014

Keywords: English Rheology and viscosity Rheometry - capillary Rheometry - rotational Polymers, plastics and rubbers Webinar - Live Eastern Time Microrheology Rheometry - microfluidic flow 

Using the Krieger-Dougherty model to predict suspension viscosity Technical Note (English)

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.

Keywords: Suspensions, slurries and pastes English Technical Note Kinexus range Rheology and viscosity Rheometry - rotational Colloids 

Evaluating product delivery characteristics from a bottle, tube or spray pack Application Note (English)

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.

Keywords: Aerosols and sprays English Application Note Kinexus range Rheology and viscosity Rheometry - rotational Consumer products Pharmaceutical formulation and development Topical semi-solid dosage forms 

Characterizing the microstructure of ‘worm-like micelles’ using rheology Application Note (English)

W 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. ...

Keywords: English Application Note Kinexus range Rheology and viscosity Rheometry - rotational Personal care Industrial detergents and surfactants Drilling fluids Liposomes and micelles Surfactants 

Overcoming and quantifying ‘Wall Slip’ in measurements made on a rotational rheometer Application Note (English)

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. ...

Keywords: Emulsions and creams Suspensions, slurries and pastes English Application Note Kinexus range Rheology and viscosity Rheometry - rotational Mining, minerals and metals 
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Polymer solution characterization – Part 4
(September 16 2014)

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