Einfluss des Verarbeitungsprozesses auf physikalische Eigenschaften von Nanocomposites

Translated title of the contribution: Influence of Processing Technique on Physical Properties of Polymer Nanocomposites

Stefan Meister

Research output: ThesisMaster's Thesis

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In the last years tailor-made polymeric materials acquired more importance due to the possibility to create the right material for technical appliance. Besides the standard additives like calcium carbonate, talc, clay and carbon black, the application of nanofillers becomes more and more important. These materials have a high potential because they can improve different physical properties with an effective low filler loading. The quality of nanocomposites prepared by melt mixing is, from the processing point of view, depending on the shear energy and the residence time applied during processing. In this master thesis shear energies applied by using different processing technologies have been measured or calculated and finally correlated with the selected physical properties of the produced components. Therefore nanocomposites were produced in two different ways, in the “one-step” and “two-step compounding”. First of all a polyethylene and polypropylene masterbatch with 50 wt% layered silicate was produced. This masterbatch was used to produce two different compounds. On the one hand a compound with 5 wt% was diluted directly during the form giving process like pipe or film extrusion as well as injection molding of the test specimen used (one-step compounding). On the other hand the dilution to 5 wt% layered silicate was achieved with a second compounding step (two-step compounding). In this master thesis the influences of this additional second compounding step on the chosen physical properties have been pointed out. The results show that the second compounding step improves the properties of O2-barrier and increases the resistance to internal pressure. The results from the injection molding specimen show that the second compounding step is leading to a very slow decrease of the E-Modulus and the scratch resistance. Nevertheless the results show that an energy plateau exists may on which optimal properties can be achieved. If more shear energy is induced on to the material, the material properties decrease. Therefore each process must be investigated for its own to figure out whether one-step ore two-step process is better for the final properties of the semi-finished products.
Translated title of the contributionInfluence of Processing Technique on Physical Properties of Polymer Nanocomposites
Original languageGerman
  • Witschnigg, Andreas, Co-Supervisor (internal)
  • Holzer, Clemens, Supervisor (internal)
Award date17 Dec 2010
Publication statusPublished - 2010

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