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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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Functionalization of Polypropylene by Grafting
Kelíšek, Petr ; Sadílek, Jiří (referee) ; Petrůj, Jaroslav (advisor)
This bachelor thesis deals with the study of functionalization of polypropylene by grafting. The theoretical part summarizes current knowledge about the properties of polypropylene, polylactic acid, radical grafting, factors influencing the properties of such functionalized polymer and modification of immiscible polymers by the aid of compatibilizer. In the experimental part, samples of polypropylene grafted with polylactic acid, and blends of polypropylene with polylactic acid were prepared on an internal mixer under different conditions. Temperature and torque were monitored during the mixing. Created materials were evaluated by comparing their base properties (tensile strength, melt flox index).
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Study of heat transport throw bulk materials with electric conductive aditive
Vacula, Jan ; Menčík, Přemysl (referee) ; Zmeškal, Oldřich (advisor)
Bachelor thesis is focused on the study of heat transport in bulk materials made from PLA (polylactic acid) filaments by 3D printing. For subsequent applications it is important to know the electrical, dielectric and thermal parameters of materials with different dyes, pigments and electrically conductive additives. The aim of this work is mainly to study the thermal properties of the series and the influence of additives on these properties. The main focus is to study the thermal properties of the samples. In the theoretical part, different 3D printing methods are mentioned, the methods of measuring the thermal properties, and finally the properties of the lactic acid polymer are described. The experimental part is devoted to the description of the process of 3D printing samples for measurements and then the method of measuring the thermal properties of the printed samples is described. For samples with electrically conductive admixtures, the thermal conductivity was found to be in the range of (0,217–0,292) W/m/K and the specific heat capacity was found to be (382,2–1 007,2) J/kg/K. The electrically conductive materials (PLA with metallic admixtures) were found to have a very good thermal conductivity and a smaller specific heat capacity, while the materials with admixtures of dyes and pigments showed a smaller thermal conductivity and a larger specific heat capacity.
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Design and efficiency of FDM printing parameters
Sysel, Karel ; Sedlák, Josef (referee) ; Zemčík, Oskar (advisor)
The essence of the work is to test the possibilities specific type of simple 3D printing device, which has recently been getting more and more into the awareness of professionals and the general public. First, the work is focused on presentation 3D printing technology and current professional equipment, in the second part are experimentally evaluated possibilities of of a simple kind of 3D printers followed by assessment of the applicability of the device in engineering practice.
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Study of Thermal Properties of Materials for 3D Printing
Lapčíková, Tereza ; Menčík, Přemysl (referee) ; Zmeškal, Oldřich (advisor)
The aim of this bachelor thesis was to study thermal properties of materials used for 3D printing (so-called filaments), especially a polylactic acid (PLA). Within the theoretical part there was performed the literature review focused on the description of different methods of 3D printing including the summary of suitable materials for these technologies. In particular, we focused on the preparation of PLA, its summarization of its chemical, physical and thermal properties and its practical use in 3D additive printing manufacturing, e.g. in biomedical applications. In the experimental part, PLA samples of different thicknesses were prepared by 3D printing technique and thermal properties such as thermal capacity and thermal conductivity were determined. It was found that thermal conductivity of studied material was 0,128 W/m/K and specific heat capacity 1335 J/kg/K. These values corresponded to the once given in the literature.
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Study of heat transport throw bulk materials with electric conductive aditive
Vacula, Jan ; Menčík, Přemysl (referee) ; Zmeškal, Oldřich (advisor)
Bachelor thesis is focused on the study of heat transport in bulk materials made from PLA (polylactic acid) filaments by 3D printing. For subsequent applications it is important to know the electrical, dielectric and thermal parameters of materials with different dyes, pigments and electrically conductive additives. The aim of this work is mainly to study the thermal properties of the series and the influence of additives on these properties. The main focus is to study the thermal properties of the samples. In the theoretical part, different 3D printing methods are mentioned, the methods of measuring the thermal properties, and finally the properties of the lactic acid polymer are described. The experimental part is devoted to the description of the process of 3D printing samples for measurements and then the method of measuring the thermal properties of the printed samples is described. For samples with electrically conductive admixtures, the thermal conductivity was found to be in the range of (0,217–0,292) W/m/K and the specific heat capacity was found to be (382,2–1 007,2) J/kg/K. The electrically conductive materials (PLA with metallic admixtures) were found to have a very good thermal conductivity and a smaller specific heat capacity, while the materials with admixtures of dyes and pigments showed a smaller thermal conductivity and a larger specific heat capacity.
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Study of Thermal Properties of Materials for 3D Printing
Lapčíková, Tereza ; Menčík, Přemysl (referee) ; Zmeškal, Oldřich (advisor)
The aim of this bachelor thesis was to study thermal properties of materials used for 3D printing (so-called filaments), especially a polylactic acid (PLA). Within the theoretical part there was performed the literature review focused on the description of different methods of 3D printing including the summary of suitable materials for these technologies. In particular, we focused on the preparation of PLA, its summarization of its chemical, physical and thermal properties and its practical use in 3D additive printing manufacturing, e.g. in biomedical applications. In the experimental part, PLA samples of different thicknesses were prepared by 3D printing technique and thermal properties such as thermal capacity and thermal conductivity were determined. It was found that thermal conductivity of studied material was 0,128 W/m/K and specific heat capacity 1335 J/kg/K. These values corresponded to the once given in the literature.
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Functionalization of Polypropylene by Grafting
Kelíšek, Petr ; Sadílek, Jiří (referee) ; Petrůj, Jaroslav (advisor)
This bachelor thesis deals with the study of functionalization of polypropylene by grafting. The theoretical part summarizes current knowledge about the properties of polypropylene, polylactic acid, radical grafting, factors influencing the properties of such functionalized polymer and modification of immiscible polymers by the aid of compatibilizer. In the experimental part, samples of polypropylene grafted with polylactic acid, and blends of polypropylene with polylactic acid were prepared on an internal mixer under different conditions. Temperature and torque were monitored during the mixing. Created materials were evaluated by comparing their base properties (tensile strength, melt flox index).
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Design and efficiency of FDM printing parameters
Sysel, Karel ; Sedlák, Josef (referee) ; Zemčík, Oskar (advisor)
The essence of the work is to test the possibilities specific type of simple 3D printing device, which has recently been getting more and more into the awareness of professionals and the general public. First, the work is focused on presentation 3D printing technology and current professional equipment, in the second part are experimentally evaluated possibilities of of a simple kind of 3D printers followed by assessment of the applicability of the device in engineering practice.
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