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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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Understanding and Controlling the Rheology of Particulate Dispersions Webinar - Live (English)

Many products (or product precursors) in the paint, personal care, cleaning, coatings and food areas, etc., contain large amounts of finely divided solid particulate material dispersed in a liquid matrix. The amount, shape, size distribution and inte...

Date:
September 22 2016
Language:
English


Virtual Seminar – Best practices for characterizing and manufacturing battery slurries and electrodes - Asia / Pacific Webinar - Live (English)

The market for batteries is rapidly growing, and the increased demand for portable electronic devices, including mobile phones and laptops requires greater advances in battery technology in order to provide a light weight, long lasting and stable pow...

Date:
November 17 2016
Language:
English


Virtual Seminar – Best practices for characterizing and manufacturing battery slurries and electrodes - Europe / US Webinar - Live (English)

The market for batteries is rapidly growing, and the increased demand for portable electronic devices, including mobile phones and laptops requires greater advances in battery technology in order to provide a light weight, long lasting and stable pow...

Date:
November 16 2016
Language:
English


Rheological measurements of biopolymers in simulated gastric fluid using PEEK geometries Poster (English)

Biopolymers are widely used in the pharmaceutical and food industries. Rheological testing of biopolymers used in these industries is necessary to provide information about their behaviour in physiological environments as their functionality within t...



Simple method for determining stress and strain constants for non-standard measuring systems on a rotational rheometer Poster (English)

There is often a necessity to measure, or at least estimate, true viscosity values using non-standard measuring systems on a rotational rheometer. This may be to replicate a mixing or manufacturing process on a lab scale, to keep a sample dispersed a...


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Simulating mastication on Kinexus rheometers

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Virtual Seminar – Best practices for characterizing and manufacturing battery slurries and electrodes - Europe / US
(November 16 2016)

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