Project Details Guidelines for shear rheometer calibration and performance check

Project No.:
2007-004-1-400
Start Date:
01 July 2007
End Date:
01 May 2017
Division Name:

Objective

To elaborate simple techniques for calibration and performance check of rotational shear rheometers and to develop widely accepted guidelines both for “ordinary users” and “rheometry experts”.

Description

Although rheometers are usually specified for certain limits (minimum/maximum torque or angular speed), it is often difficult to judge if a rheometrical result is reliable or an artefact. In many cases there are even discrepancies between different rheometers in the same lab. In the project the challenges to produce reliable data will be described using experimental results. Efficient and sensitive test methods will be elaborated and recommendations for suitable reference materials will be given. Physical (shear heating or tool inertia,…) and chemical artefacts (sample ageing, thermal degradation,…) will be demonstrated and discussed. Recommendations for temperature calibration procedures will be elaborated. Aim of the project is to develop widely accepted guidelines for the performance check of shear rheometers and for their calibration. In part 1 of the project simpler rheometrical tests are in focus (viscosity function and dynamic moduli determination) – guidelines for “ordinary users” will be developed. In part 2 more complex measurement modes will be treated (creep/recovery tests, normal stresses, stress relaxation, transient phenomena) – guidelines for “experts” will be developed.

Progress

January 2012 – A report is in preparation which will comprise a literature overview, a description of measurement modes and a section about rheometry reference fluids, both Newtonian and non-Newtonian. Procedures for exploration of rheometer measurement limits will be discussed and experimental examples will be shown. Furthermore routine calibration procedures for rheometers, in particular for the temperature control will be described.

December 2014 – A IUPAC Technical Report titled ‘Guidelines for checking performance and verifying accuracy of rotational rheometers: viscosity measurements in steady and oscillatory shear’ has been published in Pure Appl. Chem. 86(12), 1945-1968 (2014); https://dx.doi.org/10.1515/pac-2013-0601

Project completed.

Page last updated 6 Jan 2015