Number: 2007-004-1-400
Title: Guidelines for shear rheometer
calibration and performance check
Task Group
Chairman: Maximilian
Rüllmann
Members: Diana
Boos, Rüdiger
Brummer, D. J.
Dijkstra, Claus
Gabriel, Ulrich
A. Handge, Martin
Laun, Marc Mangnus,
and Wim Zoetelief
Objective:
To elaborate simple techniques for calibration and performance check
of rotational shear rheometers. 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.