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National Repository of Grey Literature 1 records found  Search took 0.03 seconds. 
The effect of bio-pigments on the properties of PLA materials for 3D printing
 Vacula, Jan ; Figalla, Silvestr (referee) ; Menčík, Přemysl (advisor)
This thesis deals with the influence of naturally derived dyes on the properties of polylactic acid (PLA) for 3D printing using the FDM method. In the production of 3D printing filaments, it was crucial to understand the behavior of bio-dyes within the material. Thermogravimetric analysis (TGA) was performed to determine the thermal stability of the bio-dyes. Based on the resulting thermal stabilities, seven bio-dyes were selected from which concentration series were prepared in the form of 3D printing filaments. The influence of adding bio-dyes to the PLA polymer matrix was defined using gel permeation chromatography (GPC). To assess the impact of bio-dyes on the mechanical properties of the materials, tensile testing and three-point bending tests were chosen. It was found that adding bio-dyes does not significantly reduce mechanical properties. Furthermore, UV stability was investigated through accelerated exposure in a chamber with a xenon lamp. The influence of UV radiation on individual bio-dyes was defined through colorimetric evaluation. The results were key for further development and optimization of the use of natural dyes in the manufacturing process of 3D printing filaments.
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