Institute of Solid State Physics
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SS22 WS22 SS23 WS23 SS24 WS24 Guidelines for Master Students
Characterisation of Post-Consumer Polymers by Rheology Polymer materials have various unique properties. Especially post-consumer recyclates (PCR) need to be characterised accurately. Viscosity of a polymer melt tell a lot about the behaviour of the material, therefore rheology measurements are chosen to characterise PCR polymers. The development of a quick and easy possibility to do this is the purpose of this work. The basic idea is to measure pressure loss if the polymer is pushed through a capillary. This measurement is done with capillary rheometer nozzles flanched in front of an extrusion system provided on a extrusion blow molding machine. Measuring pressure differences and various other parameters allows to calculate the viscosity of a polymer melt which gives many information about the physical behaviour of the material. Additionally, other measurement methods are implemented in the setup. A laser micrometer measures the diameter of the discharging material strand. This allows to gain information about the swelling behaviour of the polymer. Combined with optical light barriers it is possible to characterize the competitive forces of relaxational and elongational behaviour. Beside swelling characterisation in melted state, another method is developed to measure swelling behaviour in crystallized state after cooling down the material. Finally, colour measurements are done. |
