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Rheology is the study of flow and deformation of materials under applied forces which is routinely measured using a rheometer. The measurement of rheological properties is applicable to all materials – from fluids such as dilute solutions of polymers and surfactants through to concentrated protein formulations, to semi-solids such as pastes and creams, to molten or solid polymers as well as asphalt. Rheological properties can be measured from bulk sample deformation using a mechanical rheometer, or on a micro-scale by using a microcapillary viscometer or an optical technique such as Microrheology.

Many commonly-used materials and formulations exhibit complex rheological properties, whose viscosity and viscoelasticity can vary depending upon the external conditions applied, such as stress, strain, timescale and temperature. Internal sample variations such as protein concentration and stability, and formulation type for biopharmaceuticals, are also key factors that determine rheological properties.

Rheological properties impact at all stages of material use across multiple industries – from formulation development and stability to processing and product performance. The type of rheometer required for measuring these properties is often dependent on the relevant shear rates and timescales as well as sample size and viscosity. Examples of rheological measurements include:

  • Viscosity profiling for non-Newtonian shear-dependent behavior to simulate processing or in-use conditions.
  • Viscoelastic fingerprinting for material classification to determine extent of solid-like or liquid-like behavior.
  • Optimising and assessing dispersion stability.
  • Determination of thixotropy of paints and coatings for product application and final finish quality.
  • Impact of molecular architecture of polymers on viscoelasticity for processing and end-use performance.
  • Benchmarking Food and Personal Care products for ability to pump or spread.
  • Full cure profiling for bonding or gelling systems.
  • Pre-formulation screening for therapeutics, particularly biopharmaceuticals.

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Viscotek DSV Automated measurement of relative viscosity from dilute polymer solutions. molecular weight, molecular size, molecular structure, intrinsic viscosity by gel permeation chromatography with Viscotek
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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


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


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

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Simulating mastication on Kinexus rheometers

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Demo at your desk: Kinexus DSR
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