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Rheology is the study of flow and deformation of materials under applied forces. 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. 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 to product performance. Examples of rheological measurements include:

  • Viscosity profiling for non-Newtonian shear-dependent behavior to simulate processing or use conditions.
  • Viscoelastic fingerprinting for material classification to determine extent of solid-like or liquid-like behavior.
  • Optimising 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.
  • Preformulation screening for therapeutics, particularly biopharmaceuticals.

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An introduction to capillary rheometry - Evaluating material properties under process relevant conditions Webinar - Live (English)

Capillary rheometry has its origins in polymer melt processing, but is also directly relevant to many other material processes such as high speed coating, suspension processing, and printing applications. The technique enables key rheolog...

Date:
August 28 2014
Language:
English

Keywords: English Rheology and viscosity Rheometry - capillary Polymers, plastics and rubbers Webinar - Live Eastern Time 

Applications of rheology in the waxes, creams and emulsions arena Webinar - Live (English)

In this webinar we'll be considering materials that we’d typically measure at room temperature or perhaps a little bit above or below. However there are always exceptions and we'll be giving a flavor of the applications and use of rheolog...

Date:
August 12 2014
Language:
English

Keywords: English Rheology and viscosity Consumer products Food and drinks Specialty chemicals Webinar - Live Eastern Time 


Evaluating product delivery characteristics from a bottle, tube or spray pack Application Note (English)

Many products are packaged in tubes or bottles and must be pumped through a nozzle. This application note shows how stress requirements for pumping and recovery following extrusion can be determined.


Keywords: Aerosols and sprays English Application Note Kinexus range Rheology and viscosity Rheometry - rotational Consumer products Pharmaceutical formulation and development Topical semi-solid dosage forms 

Characterizing the microstructure of ‘worm-like micelles’ using rheology Application Note (English)

W orm-like micelles have widespread use across a range of industries. This application note shows how it is possible to extract key microstructural information about these systems using rotational rheometry. ...


Keywords: English Application Note Kinexus range Rheology and viscosity Rheometry - rotational Personal care Industrial detergents and surfactants Drilling fluids Liposomes and micelles Surfactants 
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Applications of rheology in the waxes, creams and emulsions arena
(August 12 2014)

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