M00001445
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ISO 6721-10 3rd Edition, September 15, 2015 Plastics - Determination of dynamic mechanical properties - Part 10: Complex shear viscosity using a parallel-plate oscillatory rheometer
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Availability date: 07/13/2021
Description / Abstract:
This part of ISO 6721 specifies the general principles of a
method for determining the dynamic rheological properties of
polymer melts at angular frequencies typically in the range of 0,01
rad·s-1 to 100 rad·s-1 by means of an oscillatory rheometer with a
parallel-plate geometry. Angular frequencies outside this range can
also be used (see Note 1). The method is used to determine values
of the following dynamic rheological properties: complex shear
viscosity η*, dynamic shear viscosity η', the out-of-phase
component of the complex shear viscosity η", complex shear modulus
G*, shear loss modulus G", and shear storage modulus G'. It is
suitable for measuring complex shear viscosity values typically up
to ~10 MPa·s (see Note 2).
NOTE 1 The angular-frequency measurement range is limited by the
specification of the measuring instrument and also by the response
of the specimen. When testing using angular frequencies lower than
0,1 rad·s–1, the test time can increase significantly as the time
taken to obtain a single measurement is proportional to the
reciprocal of the angular frequency. Consequently, when testing at
low angular frequencies, degradation or polymerization of the
specimen is more likely to occur and have an effect on the results.
At high angular frequencies, the specimen can distort or fracture
at the edge, consequently invalidating the test results.
NOTE 2 The range of complex shear viscosity values that can be
measured is dependent on the specimen dimensions and also the
specification of the measuring instrument. For a specimen of given
dimensions, the upper limit of the range is limited by the
machine's torque capacity, angular-displacement resolution, and
compliance. However, correction can be made for compliance
effects.