This part of ISO 6721 describes a flexural, non-resonance method for determining the components of the Young's complex modulus E of polymers at fre-quencies typically in the range 0,01 Hz to 100 Hz. The method is suitable for measuring dynamic storage moduli in the range 10 MPa to 200 GPa. Although materials with moduli less than 10 MPa may be studied, more accurate measurements of their dy-namic properties can be made using shear modes of deformation (see part 6 of ISO 6721).
This method is particularly suited to the measurement of loss factors greater than 0,1 and may 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 6721-1:1994, subclause 9.4). 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 present dynamic properties over an extended fre-quency range at different temperatures.
BS 2782-3 Method 323B:1996 Referenced Document
ISO 6721-1:1994 Plastics - Determination of dynamic mechanical properties - Part 1: General principles
ISO 6721-6:1996 Plastics - Determination of dynamic mechanical properties - Part 6: Shear vibration - Non-resonance method