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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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Making squeeze flow measurements on a rotational rheometer Webinar - Live (English)

Squeeze flow rheometry involves compressing a material between two parallel plates in order to determine its rheological properties. Squeeze flow measurements can be made with a rotational rheometer having suitable axial capabilities (normal force an...

Product:
Kinexus range
Date:
September 24 2015
Language:
English


Understanding Yield Stress Measurements Whitepaper (English)

This Whitepaper discusses the various approaches available to measure yield stress, and the practical measurement set-up and test parameters to obtain relevant, robust and reliable yield stress data using a rotational rheometer.



Chewing the fat Article (English)

Dr Steve Carrington of Malvern Instruments and Prof. D. J. McClements of the University of Massachusetts describe the use of rheology to measure how food changes during mastication and to compare the rheological behaviour of low fat sauces with consu...



Optimizing Rheology for Paint and Coating Applications Whitepaper (English)

This whitepaper discusses the use of rheology for optimizing the performance of paints and coatings



Overcoming solvent evaporation/drying during rheological testing on rotational rheometer Application Note (English)

This application note shows how using a solvent trap can be used to prevent sample drying/solvent loss during extended testing, helping to ensure that only rheological changes are being measured and not artifacts resulting from drying of the sample a...


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Upcoming webinar

Making squeeze flow measurements on a rotational rheometer
(September 24 2015)

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