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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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Kinexus range Next generation rheometer redefines ease of use Image
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Rosand range Capillary rheometers for process-relevant material testing. Image
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DSR Industry standard Asphalt binder grade testing Image
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Viscosizer TD Automating ultra-low volume Taylor Dispersion Analysis Image
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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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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


Using rheology to study the hardness and spreadability of butter Application Note (English)

Butter is a multiphase emulsion consisting of fat globules, crystalline fat and an aqueous phase dispersed in a continuous oil phase. This complex microstructure governs the physical properties of butter including its texture, appearance and how easi...



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


Rheology Focus Forum: The importance of good rheological data in co-extrusion processes Webinar - Recorded (English)

The presentation will discuss the coextrusion of two polymer melts in a specially designed die attached to a twin bore capillary rheometer. Physical compatibility and interfacial effects are examined. The melts were characterized in shear and extensi...

Product:
Bohlin range
Date recorded:
November 27 2006
Language:
English

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Simulating mastication on Kinexus rheometers

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Upcoming webinar

Rheological characterization of asphalt binders at low temperatures by using the 4-mm DSR technique. Part 2
(February 17 2016)

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