(WLF equation) An empirical equation for the Time-Temperature Equivalence of creep and other properties, that has been successful with many plastics. It is
where T and T g = the temperature of interest and the glass-transition temperature of the polymer, and a T is the Shift Factor, i.e., the ratio of the viscosities at the two temperatures. The equation holds over the range from T g to about T g + 100 K.
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Gooch, J.W. (2011). Williams-Landell-Ferry Equation. In: Gooch, J.W. (eds) Encyclopedic Dictionary of Polymers. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-6247-8_12844
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DOI: https://doi.org/10.1007/978-1-4419-6247-8_12844
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