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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 product, cleaning, coatings product, and food areas, etc., include a large amount of finely divided solid particulate material in a liquid matrix. The amount, shape, size distribution and i...

Date:
September 22 2016
Language:
English


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...



An algebraic approach for determining viscoelastic moduli from creep compliance Poster (English)

DLS Microrheology involves tracking the time dependent motion or mean square displacement of dispersed tracer particles of known size using Dynamic Light Scattering (DLS) in order to determine viscoelastic properties of the dispersion medium. The vis...



Using rheology to enhance formulation Article (English)

Viscometers are used routinely to characterise food and drink roducts and offer simple, straightforward measurement for QC. They are also applied in formulation, but here rheology has far more to offer than simple viscosity measurements. Switching fr...



Setting a benchmark: Using rheology to define the performance of personal care products Article (English)

Products, quality is often defined by a range of functional and sensory attributes, some of which may be easily measured - such as color - and others which may not. Visual or textural appearance and ease of application exemplify properties in this se...


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Simulating mastication on Kinexus rheometers

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Understanding and Controlling the Rheology of Particulate Dispersions
(September 22 2016)

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