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DMA Master Curves
The frequency behavior of viscoelastic polymeric materials is essential and has been investigated intensively by Williams, Landel, and Ferry. The time-temperature superposition allows the extension of the experimentally accessible frequencies from about 4 decades, up to about 20 decades. Individual isothermal DMA curves measured at different frequencies are shifted towards a selected reference temperature to create a so-called master curve. This enables the description of the entire relaxation behavior of polymers.
In this Webinar, we will show how dynamic mechanical analysis can be used to predict material performance at frequencies outside the range that can be measured with a dynamic mechanical analyzer.
The behavior of viscoelastic materials, like polymers, depends on frequency and temperature. In general, there is equivalence between the frequency and temperature behavior during transition processes. Since the frequency dependence is directly related to time dependence, the relationship is usually referred to as the Time-Temperature Superposition principle (TTS).
The TTS principle is the theoretical basis of the master curve technique. A master curve is often used to predict material performance at frequencies outside the range that can be measured with a dynamic mechanical analyzer. It is constructed by shifting isothermal frequency sweeps at different temperatures according to the TTS principle.
Various models have been developed to describe the shift behavior. In the TTS software option, the well-known Williams–Landel–Ferry (WLF) model is implemented for automatic master curve construction.
The Webinar covers the following topics:
Once you have registered for the Webinar, you will receive all the information you need about this interesting subject.
After the presentation, which is held in English, you will have the opportunity to discuss points of interest directly with METTLER TOLEDO application specialists.