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[FAQ]

The amorphous polymers are known to have a hard, brittle behavior below the glass transition temperature and this behavior changes to a compliant, rubbery behavior beyond the glass transition temperature. Due to this, it is generally recommended to use the thermo-viscoelasitc models in the ranges of temperature that does not include the glass transition temperature. However, there is no mathematical limitations in the WLF or the TN shift functions. A better way to go about this is to obtain the data and develop the viscoelastic master curve. Then plot the shift function over the range of interest and see if you can fit the WLF or TN function to the experimental shift function. If you can’t fit the shift function with a built in model, a user shift function or user material will be required.