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BS ISO 20965:2021 – TC

BS ISO 20965:2021 – TC

$186.33

Tracked Changes. Plastics. Determination of the transient extensional viscosity of polymer melts

Published By Publication Date Number of Pages
BSI 2021 54
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This document specifies the general principles of a method for determining the transient extensional viscosity of polymer melts. The procedure details the measurement of polymer melt specimens stretched uniaxially under conditions of constant strain rate and constant temperature.

The method is capable of measuring the transient extensional viscosity of polymer melts at Hencky strain rates typically in the range 0,01 s–1 to 1 s–1, at Hencky strains up to approximately 4 and at temperatures up to approximately 250 °C (see NOTEs 1 and 2). It is suitable for measuring transient extensional viscosity values typically in the range from approximately 104 Pa?s to 107 Pa?s (see NOTE 3).

NOTE 1

Hencky strains and strain rates are used (see Clause 3).

NOTE 2

Values of strain, strain rate and temperature outside these limiting values can be attained.

NOTE 3

The operating limit of an instrument, in terms of the lowest transient extensional viscosity values that can be measured, is due to a combination of factors, including the ability of the specimen to maintain its shape during testing and the resolution of the instrument.

PDF Catalog

PDF Pages PDF Title
30 undefined
34 Foreword
35 1 Scope
2 Normative references
3 Terms and definitions
37 4 General principles
5 Apparatus
5.1 General description
39 5.2 Silicon oil bath/temperature-controlled chamber
40 5.3 Temperature measurement and control
5.4 Strain and strain rate measurement
5.5 Force measurement
5.6 Calibration
41 6 Sampling and specimen preparation
6.1 Sampling
6.2 Specimen preparation
6.3 Specimen mounting
42 7 Procedure
7.1 Specimen loading
7.2 Pre-conditioning of the specimen
7.3 Testing
43 8 Analysis of extensional flow measurements
8.1 Symbols used
8.2 Analysis of extensional flow
8.2.1 General
44 8.2.2 Analysis for type A and B instruments (rotating clamps)
45 8.2.3 Analysis for type C and D instruments (translating clamps)
9 Precision
46 10 Test report
47 Annex A (informative) Checking for swelling of specimens due to immersion in silicone oilor other fluids
48 Annex B (informative) Uncertainties in transient extensional viscosity testing
53 Bibliography

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BS ISO 20965:2021 - TC
$186.33