Time–temperature superposition

It is vital to construct a master curve considering time and temperature variation to show rheological and mechanical behavior of a viscoelastic material in a wide range of time or frequency. The concepts of time–temperature superposition principle (TTSP), shift factor, and shift function are introduced and discussed in this chapter, which are required to construct a master curve for a viscoelastic function. Then, theoretical background and mathematical formulations are presented so that readers can find a simple procedure to construct a real master curve and probable challenges they may subject to them.