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<p>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.</p>
<p>The method is capable of measuring the transient extensional viscosity of polymer melts at Hencky strain rates typically in the range 0,01 s<sup>–1</sup> to 1 s<sup>–1</sup>, 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 10<sup>4</sup> Pa⋅s to 10<sup>7</sup> Pa⋅s (see NOTE 3).</p>
<p>NOTE 1 Hencky strains and strain rates are used (see Clause 3).</p>
<p>NOTE 2 Values of strain, strain rate and temperature outside these limiting values can be attained.</p>
<p>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.</p>
Reģistrācijas numurs (WIID)
80005
Darbības sfēra
<p>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.</p>
<p>The method is capable of measuring the transient extensional viscosity of polymer melts at Hencky strain rates typically in the range 0,01 s<sup>–1</sup> to 1 s<sup>–1</sup>, 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 10<sup>4</sup> Pa⋅s to 10<sup>7</sup> Pa⋅s (see NOTE 3).</p>
<p>NOTE 1 Hencky strains and strain rates are used (see Clause 3).</p>
<p>NOTE 2 Values of strain, strain rate and temperature outside these limiting values can be attained.</p>
<p>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.</p>
