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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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Using rheology as a Benchmarking tool Webinar - Live (English)

The fundamental principle of designing products for various applications lies in the ability to accurately engineer the microstructural properties to achieve the desired performance response. Rheology presents itself as a unique tool to not only prov...

Date:
June 18 2015
Language:
English

Keywords: English Rheology and viscosity Rheometry - capillary Webinar - Live Eastern Time Rheometry - microfluidic flow 

Rheology Masterclass 2 – The basics of viscoelasticity Webinar - Recorded (English)

Rheology is defined as the science of deformation and flow and in particular refers to materials that show viscoelastic or non-Newtonian behaviour when stressed. Such materials include suspensions, emulsions, polymer solutions and foams to name but a...

Product:
Kinexus range
Date recorded:
May 14 2015
Language:
English

Keywords: English Kinexus range Rheology and viscosity Rheometry - rotational Webinar - Recorded Eastern Time 

The rheology of cheese and mayonnaise Webinar - Recorded (English)

Ever thought of rheology when you eat a pizza? The classic marketing shots of pizza show the viscoelastic properties of the mozzarella cheese amenable to a number of rheological measurements. The pour properties of mayonnaise are dictated by a number...

Product:
Kinexus range,DSR
Date recorded:
April 29 2015
Language:
English

Keywords: English Kinexus range Rheology and viscosity Rheometry - rotational Food and drinks Webinar - Recorded Eastern Time DSR 

Predicting the compounding performance of Pressure Sensitive Adhesives (PSA’s) Application Note (English)

This note discusses a method for assessing pump-ability and mix-ability of Pressure Sensitive Adhesives during manufacture 


Keywords: Development Production and process control (PAT and QbD) Bonding and curing systems English Application Note Kinexus range Rheology and viscosity Adhesives and sealants 

Dependance of viscosity and foam consistency on gas volume fraction Application Note (English)

This note describes an empirical method for correlating foam rheology with gas volume fraction


Keywords: Foams English Application Note Kinexus range Rheology and viscosity 
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Using rheology as a Benchmarking tool
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