NBN ISO 6721-4:2021

This document describes a forced, non-resonance method for determining the components of the tensile
complex modulus E* of polymers at frequencies typically in the range 0,01 Hz to 100 Hz.
NOTE Higher frequency measurements can be made, but significant errors in the dynamic properties
measured are likely to result (see 10.2.2 and 10.2.3).
The method is suitable for measuring dynamic storage moduli in the range 0,01 GPa to 5 GPa. Although
materials with moduli outside this range can be studied, alternative modes of deformation are intended
to be used for higher accuracy [i.e. a shear mode for G' < 0,01 GPa (see ISO 6721-6) and a flexural mode
for E' > 5 GPa (see ISO 6721-3 or ISO 6721-5)].
This method is particularly suited to the measurement of loss factors and can therefore be conveniently
used to study the variation of dynamic properties with temperature and frequency through most of the
glass-rubber relaxation region (see ISO 6721-1). The availability of data determined over wide ranges
of both frequency and temperature enables master plots to be derived, using frequency-temperature
shift procedures, which display dynamic properties over an extended frequency range at different
temperatures.