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Gewählte Master / Diploma Thesis:

Stefan Kaltenbrunner (2016): Ligninbasierte Karbonpartikel als Additive in einem Biokunststoff.
Master / Diploma Thesis - Institut für Holztechnologie und Nachwachsende Rohstoffe, BOKU-Universität für Bodenkultur, pp 46. UB BOKU obvsg

Data Source: ZID Abstracts
Abstract:
In the following study the structure of Lignin particles, extracted by an Organsolv process, is investigated. Furthermore the effect of thermostabilization and high temperature treatment on this organic substance is documented. Finally the modified particles where implemented in a polymer matrix out of Polylactic acid and the effect on the mechanical and electrical properties was evaluated. The amount of particles in the blend varied and was enhancend from pure Polylactic acid in steps from 5% up to an total amount of 35 % (mass). The results showed that 30% carbonized lignin is necessary to change the bio plastic from an isolator to a conductor. Beside this shift concerning the electrical properties the tensile strength was reduced by half (maximum lignin amount) compared to the values reached by pure Polylactic acid. Additionally a technique to change and control the size of the Lignin particles in a defined way was tested. By the method of liquid antisolvent precipitation Lignin was first totally dissolved in an ethanol water solution and afterwards an over saturation of the solution with purified water was initiated. The impact of varying investigation parameters (particle cvoncentration, precipitation time, usage of a dispersant) on particle size and distribution was documented. For the analysis of the particles, images with an electron microscope where taken and the size and distribution was determinend with the computer software ImageJ. For a comparrison, lignin of two different suppliers was used throughout the study.

Beurteilende(r): Gindl-Altmutter Wolfgang

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