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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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Using rheology to understand the structure-processing-property relationships of thermoplastic melts and composites Webinar - Live (English)

In this webinar we will show how to measure and apply rheological material functions which are relevant to polymer fabrication and processing. We will address the four general categories of requirements for manufacturing the thousands of products pro...

Product:
Kinexus range
Date:
June 16 2016
Language:
English


Demo at your desk: Kinexus Webinar - Recorded (English)

This live online demo is designed to provide you with a virtual hands-on introduction to the Kinexus rheometer. In this webinar, you will be able to take a look at the Kinexus rheometer and some of its typical measurement systems (geometries) and acc...

Product:
Kinexus range
Date recorded:
April 28 2016
Language:
English


Using particle size analysis and rheology to better understand the mouthfeel of chocolate Webinar - Recorded (English)

Chocolate is an affordable yet luxurious treat with mature markets in Europe and North America and developing markets around the world. The secret of chocolate’s almost universal appeal is in the mouthfeel – the “snap” of the first bite, how the choc...

Date recorded:
March 24 2016
Language:
English


Thixotropy! What is it? Why is it important? How do I measure it? Webinar - Recorded (English)

Thixotropy is associated with reversible, microstructural and time dependent changes that come about due to local spatial rearrangement of microstructural components in a structured fluid. This frequently found time-response of a microstructure th...

Product:
Kinexus range
Date recorded:
March 16 2016
Language:
English


Comparing the rheology and particle size of smoothies made with different blenders Application Note (English)

Two smoothie makers have been evaluated and compared by measuring the particle (fiber) size and viscosity of two different smoothies recipes to see which smoothie maker gave the smoothest blend. 


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Glossary

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Simulating mastication on Kinexus rheometers

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Upcoming webinar

Using rheology to understand the structure-processing-property relationships of thermoplastic melts and composites
(June 16 2016)

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