Abstract:
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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
measurement procedures.
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
-
1
.
All measurements
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. |