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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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Demo at your desk: Kinexus DSR Webinar - Live (English)

The Kinexus DSR demo at your desk will provide an overview of the instrument operation for day to day routine asphalt testing for QC and research, as well as cover many unique features designed to provide improved lab efficiency. Participants will se...

Product:
Kinexus DSR range
Date:
July 28 2016
Language:
English


A Basic Introduction to Rheology Whitepaper (English)

Rheometry refers to the experimental technique used to determine the rheological properties of materials; rheology being defined as the study of the flow and deformation of matter which describes the interrelation between force, deformation and time....



Using rheology to understand the structure-processing-property relationships of thermoplastic melts and composites Webinar - Recorded (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 recorded:
June 16 2016
Language:
English


Time to spec up? Top five reasons to replace a viscometer with a rheometer Whitepaper (English)

Is your viscometer approaching the end of its life? Are you starting to feel that your trial and error, ‘rheology-light’ approach to formulation is becoming dated? Or are there longstanding product performance issues that you’re failing to gain tract...



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

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Simulating mastication on Kinexus rheometers

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Demo at your desk: Kinexus DSR
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