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Hot Embossing by Matthias Worgull

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3.3.3. Viscoelastic Behavior of Polymer Melts

3.3.3.1. Definition of Viscoelasticity

For polymers, three different superimposing deformations can be distinguished [3]:

  • elastic deformation (spontaneous and reversible)
  • viscoelastic deformation (time dependent and reversible)
  • viscous deformation (time dependent and irreversible)

Most polymers show an elastic and viscous behavior. This viscoelastic behavior is valid for solids as well as for melts. This viscoelastic behavior in a polymer melt becomes noticeable if the state of deformation changes over time. A pure viscous media during a deformation, the shear stress is proportional to the velocity of deformation. Viscoelastic behavior is, in contrast to this, characterized by a time-dependent ...

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