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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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Assessing product stability during transportation using a rotational rheometer Application Note (English)

This note discusses a simple rheological test for assessing product stability during transportation


Keywords: Emulsions and creams Suspensions, slurries and pastes English Application Note Kinexus range Rheology and viscosity Rheometry - rotational 

Evaluating non-linear viscoelastic effects using normal force measurements on a rotational rheometer Application Note (English)

This note discusses how non-linear viscoelastic effects can be evaluated using normal force measurements on a rotational rheometer


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

Effect of droplet concentration on emulsion viscosity Application Note (English)

This note discusses how rotational rheometry can be used to evaluate the impact of droplet concentration on emulsion viscosity


Keywords: Emulsions and creams English Application Note Kinexus range Rheology and viscosity Rheometry - rotational Consumer products Food and drinks 

The rheology of cheese and mayonnaise Webinar - Live (English)

Ever thought of rheology when you eat a pizza? The classic marketing shots of pizza show the viscoelastic properties of the mozarella cheese amenable to a number of rheological measurements. The pour properties of mayonnaise are dictated by a number ...

Date:
April 29 2015
Language:
English

Keywords: English Rheology and viscosity Rheometry - rotational Food and drinks Webinar - Live Eastern Time 

Measuring the rheology of polymer solutions Whitepaper (English)

The whitepaper discusses some basic principles of polymer solution rheology and how it can be measured and manipulated to optimize rheological behaviour 


Keywords: Polymer solutions English Whitepaper Kinexus range Rheology and viscosity Rheometry - rotational Polysaccharides Microrheology m-VROCi Rheometry - microfluidic flow 
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The rheology of cheese and mayonnaise
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