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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 - Recorded (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 joint lubricat...

Zetasizer Nano ZS,Kinexus range,Rosand range,Zetasizer Nano ZSP,m-VROCi
Date recorded:
September 16 2014

Keywords: Polymer solutions English Kinexus range Rosand range Rheology and viscosity Dynamic Light Scattering Rheometry - capillary Rheometry - rotational Polymers, plastics and rubbers Paints, inks and coatings Food additives Webinar - Recorded Eastern Time Zetasizer Nano ZS Zetasizer Nano ZSP Microrheology m-VROCi Rheometry - microfluidic flow 

Processing non-Newtonian products: Determining the pressure drop for a power law fluid along a straight circular pipe Application Note (English)

This application note shows how to predict the pressure requirements for a non-Newtonian liquid to flow through a straight circular pipe.

Keywords: English Application Note Kinexus range Rheology and viscosity Rheometry - rotational 

Ten Ways to…..Optimize Rheology to Increase Dispersion/Colloidal/Emulsion Stability Whitepaper (English)

This whitepaper highlights some of the general considerations for designing and interpreting rheological tests and data in order to optimize dispersion stability.

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

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 
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