BS ISO 6721-10:2015
$142.49
Plastics. Determination of dynamic mechanical properties – Complex shear viscosity using a parallel-plate oscillatory rheometer
| Published By | Publication Date | Number of Pages |
| BSI | 2015 | 28 |
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).
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.
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.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 6 | Foreword |
| 7 | 1 Scope 2 Normative references 3 Terms and definitions |
| 8 | 4 Principle 5 Apparatus 5.1 Measurement apparatus |
| 9 | 5.2 Temperature-controlled enclosure 5.3 Temperature measurement and control |
| 10 | 5.4 Plate/specimen assembly 5.5 Calibration 6 Sampling |
| 11 | 7 Procedure 7.1 Test temperature 7.2 Zeroing the gap 7.3 Introducing the test specimen 7.4 Conditioning the test specimen 7.5 Test mode (controlled stress or controlled strain) |
| 12 | 7.6 Determination of thermal stability of sample material 7.7 Determination of region of linear-viscoelastic behaviour 7.7.1 In the controlled-strain mode 7.7.2 In the controlled-stress mode |
| 13 | 7.7.3 Confirmation of linear-viscoelastic behaviour 7.8 Frequency sweep 7.9 Temperature sweep 7.10 Air entrapment 8 Expression of results 8.1 Symbols used |
| 14 | 8.2 Calculation of complex shear modulus and complex shear viscosity |
| 16 | 9 Precision |
| 17 | 10 Test report |
| 18 | Annex A (informative) Uncertainty limits |
| 21 | Annex B (informative) Verification of rheometer performance |
| 25 | Bibliography |
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BS ISO 6721-10:2015 – TC:2020 Edition
Tracked Changes. Plastics. Determination of dynamic mechanical properties – Complex shear viscosity using a parallel-plate…
