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Hot Embossing by Matthias Worgull

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3.8. Thermal Aggregate States of Polymers

During a molding cycle a thermoplastic polymer passes several temperature-dependent aggregate states. Switching to another aggregate state changes the material properties significantly. Because of the molecular structure of amorphous and semicrystalline polymers, different aggregate states and different transition ranges can be determined. The thermal behavior of thermoplastic polymers can be described, illustrated by the time-dependent shear modulus over temperature.

3.8.1. Thermal Behavior of Amorphous Polymers

The time-dependent behavior of the shear modulus is illustrated for an amorphous polymer in Fig. 3.22.

Figure 3.22. Thermal behavior of an amorphous polymer. The thermal behavior is characterized ...

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