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carreau-yasuda-regression-method

The standard tests for measuring the Zero-Shear Viscosity are:

  1. Flow curve in order to determine the plateau value of the vis­cosity performing a shear rate controlled flow curve at low enough shear rates in steady state.
  2. Creep test (step stress test) in order to determine the viscosity in the stationary flow region.
  3. Frequency sweep in order to determine the plateau value of the complex viscosity |η*| at low enough angular frequencies.

An application report produced by Anton Paar explains why the Frequency Sweep is considered the favoured method, as it provides accurate results and additional information about the molecular structure and the visco-elastic properties of a sample (storage modulus and loss modulus as well as damping factor).

In the same report, the zero-shear viscosity is calculated using the Carreau-Yasuda regression, a very practical approach for getting an average value for the relaxation time of a measured polymer sample and the Zero-Shear Viscositywhich is needed for the molar mass calculation.

Follow the link above to have your full copy of the application report with the results of this experiment.

Anton Paar Ltd

Anton Paar develops, produces and distributes highly accurate laboratory instruments and process measuring systems, and provides custom-tailored automation and robotic solutions.

Anton Paar develops, produces and distributes highly accurate laboratory instruments and process measuring systems, and provides custom-tailored automation and robotic solutions.

It is the world leader in the measurement of density, concentration and CO2 and in the field of Rheometry. Other areas of specialty are: Viscometry, Polarimetry, Refractometry, Microwave Sample Preparation & Synthesis, Chemical and Mechanical Surface and Nanostructure Analysis.

With over 2200 employees at the headquarters in Graz (Austria) and the 25 sales subsidiaries worldwide, Anton Paar ensure that their products live up to their excellent reputation. The core competence of the company – high-precision production – and close contact to the scientific community form the basis for the quality of Anton Paar’s instruments.

A strong sales network in more than 110 countries guarantees customers rapid support and answers to their application and service queries.

Innovation is the basis for progress and every year Anton Paar invests more than 20 percent of the annual turnover in R&D.

Anton Paar Limited, a subsidiary of Anton Paar GmbH, provides sales, application support and service to users across the UK and Ireland.

With an office in St Albans (UK) and Dublin (Ireland) and a team of over 30 dedicated employees, Anton Paar Limited aims to provide first-class service at every stage in the customer relationship, ensuring our products live up to their excellent reputation.

Anton Paar Ltd
Unit F, The Courtyard
St Albans
AL4 0LA
UK

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