塑料 - 测定动态机械性能的 - 第7部分:扭转振动 - 非共振法

[中文适用范围]： 该文件描述了一种扭转、非共振方法，用于确定棒或棒形式的固体聚合物在频率通常在0.001Hz至100Hz范围内的剪切复数模量G*的分量。 可以进行更高频率的测量，但可能会导致测量的动态特性出现重大误差（见 10.2.1 和 10.2.2）。 该方法适用于测量动态储能模量，范围从约 10 MPa（硬橡胶获得的典型值）到约 10 GPa（纤维增强塑料的代表值）。 尽管可以研究模量小于 10 MPa 的材料，但可以使用平行板之间薄层的简单剪切（参见 ISO 6721-6）或扭转变形来更准确地测量其动态特性。 该方法特别适合测量大于 0.02 的损耗因数，因此可方便地用于研究大部分玻璃橡胶松弛区域的动态特性随温度和频率的变化（参见 ISO 6721-1）。 在较宽的频率和温度范围内确定的数据的可用性使得能够使用频率-温度变换程序导出主图，该程序显示不同温度下扩展频率范围内的动态特性。 注：虽然使用扭摆可以更准确地确定低于 0.1 的损耗因数（参见 ISO 6721-2），但本文件中描述的方法可以覆盖更宽且连续的频率范围。 [外文原描述]： This document describes a torsional, non-resonance method for determining the components of the shear complex modulus G* of solid polymers in the form of bars or rods at frequencies typically in the range 0,001 Hz to 100 Hz. Higher-frequency measurements can be made, but significant errors in the dynamic properties measured are likely to result (see 10.2.1 and 10.2.2). The method is suitable for measuring dynamic storage moduli ranging from about 10 MPa, which is typical of values obtained for stiff rubbers, to values of about 10 GPa which are representative of fibre-reinforced plastics. Although materials with moduli less than 10 MPa can be studied, more accurate measurements of their dynamic properties can be made using simple shear (see ISO 6721-6) or torsional deformations of thin layers between parallel plates. This method is particularly suited to the measurement of loss factors greater than 0,02 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). The availability of data determined over wide ranges of both frequency and temperature enable master plots to be derived, using frequency-temperature shift procedures, which display dynamic properties over an extended frequency range at different temperatures. NOTE Although loss factors below 0,1 can be more accurately determined using the torsion pendulum (see ISO 6721‑2), the method described in this document enables a much wider and continuous frequency range to be covered.