Deutsch
English
Maria Sonnenberg
| Title | Interaction of polycarbonate melt with tool surfaces as a cause of coating formation in plastics processing machines |
| ISBN | 978-3-8440-6797-2 |
| Type of publication | dissertation |
| Language | German, English |
| Pages | 144 pages |
| Format | 21 x 14.8 cm |
| price | 45,80 € / 57,30 SFr |
| Publication date | 2019 |
| Published by | Shaker Publishing House GmbH |
Summary
In this dissertation, the mechanisms of coating and speck formation were fundamentally investigated using the example of polycarbonate. In addition to the topographical influences (cavities and roughness), the interactions between the metallic surface and the polymer were analyzed using surface-sensitive measuring methods.
In addition to the analytical investigations, both laboratory tests (syntheses) and extrusion tests were carried out on a laboratory scale.
The diffusion of metal ions (iron and chromium ions) into the polymer melt was demonstrated. A subsequent interaction between polymer and metal ions was also investigated.
The possible degradation of polycarbonate in plastics processing machines was specifically analyzed using a mini extruder and degradation experiments.
It was shown that temperature has the greatest influence on degradation compared to dwell time and speed. Finally, a possible mechanism and a list of requirements for avoiding or reducing the formation of deposits were formulated.
