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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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Rheological characterization of asphalt binders at low temperatures by using the 4-mm DSR technique. Part 2 Webinar - Live (English)

Recently, it has become increasingly popular to measure the low-temperature rheological properties of asphalt binders by using 4-mm parallel plate geometry on a rotational rheometer. In this webinar, rheological data measured with this so-called “4-m...

Product:
Kinexus DSR range
Date:
February 17 2016
Language:
English


Suspension stability: Why particle size, zeta potential and rheology are important Webinar - Live (English)

Suspensions or dispersions of particles or droplets in a liquid medium are encountered in a variety of industries and find use in a diverse range of applications. These include liquid abrasives, ceramics, medicines, foodstuffs and inks to name a few....

Product:
Mastersizer range,Kinexus range,Zetasizer range
Date:
February 11 2016
Language:
English


Rheological characterization of asphalt binders at low temperatures by using the 4-mm DSR technique. Part 1 Webinar - Recorded (English)

Recently, it has become increasingly popular to measure the low-temperature rheological properties of asphalt binders by using 4-mm parallel plate geometry on a rotational rheometer. This webinar provides a general overview of this novel measurement ...

Product:
Kinexus DSR range
Date recorded:
January 14 2016
Language:
English


Optimizing Fluid Rheology for Enhanced Oil Recovery Applications Webinar - Recorded (English)

Enhanced Oil Recovery (EOR) is gaining increasing attention due to the need of oil extraction in efficient manners and difficulties in finding a new oil field. With traditional methods, only about 20-40% of oil is extracted from an oil reservoir, lea...

Product:
Kinexus range
Date recorded:
December 8 2015
Language:
English


Making squeeze flow measurements on a rotational rheometer Webinar - Recorded (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 recorded:
September 24 2015
Language:
English

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Simulating mastication on Kinexus rheometers

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Suspension stability: Why particle size, zeta potential and rheology are important
(February 11 2016)

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