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This bachelor thesis does a theoretic approach to the basics of Viscosity,
Fluids, Plastics, Polymers, Rheology and Rheometry before explaining, defining
and studying the results of the carried out
The studied plastics are Lupolen 1800 H (HDPE), Moplen 340 K (PP), and
Polystyrene 158 K (PS) at ranges of temperatures between 180ºC and 240ºC
and apparent shear rates mainly between 100 and 10000s
have been mad
e with the Haake Rheocap T100, a High Pressure Capillary
Viscosimeter at the Rheology laboratory of the Hochschule Darmstadt.
At the end of the project, the flow curves of all materials have been analyzed.
This analysis includes a comparison between measu
rements with different die
angle but same other test conditions, comparison between the results of the
Rheotens and the High Pressure Capillary Viscosimeter and a determination of
the critical shear rates for each material under these conditions.
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