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Technology of waste polylactide recyclation for 3D print
Kecíková, Alžbeta ; Tocháček, Jiří (oponent) ; Přikryl, Radek (vedoucí práce)
This bachelor thesis deals with the recycling of waste polylactide from the production process and its subsequent use in 3D printing. To optimize the recycling process of polylactic acid, it was recycled with the addition of various additives such as poly(3-hydroxybutyrate), talc, limestone and chain extenders Joncryl 4368-CS and Raschig Stabilizer 9000. These materials were also investigated with the addition of the acetyl tributyl citrate plasticizer. Samples of the mixtures were prepared on a twin-screw extruder and subsequently a filament was obtained using a single-screw extruder, which was then used for 3D printing by fused deposition modelling (FDM) technology. Temperature towers were printed to obtain optimal processing temperatures for 3D printing. The effect of the additives on the characteristic temperatures and the degree of crystallinity of the PLA was determined by differential scanning calorimetry. The effect of the processing on the molecular chain of selected samples was observed by gel permeation chromatography. Furthermore, in the experimental part of the bachelor thesis, the influence of additives on mechanical properties such as modulus of elasticity, tensile strength and elongation was investigated. The molecular weight was increased due to the chain extenders. Of the particle fillers for the PLA matrix, talc had better mechanical properties than limestone. The greatest effect of the plasticizer was in a mixture with poly(3-hydroxybutyrate).
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Recyklace lakovaných polykarbonátových dílů
Navrátilová, Šárka ; Petruš, Josef (oponent) ; Kučera, František (vedoucí práce)
Práce se zabývá možnostmi recyklace lakovaných polykarbonátových dílů. Praktická část práce zkoumá vliv koncentrace laku, jemnosti mletí drti, extruze a kompatibilizátorů na vybrané vlastnosti mechanicky recyklovaných dílů. Tahovými zkouškami byla stanovena mez kluzu, maximální napětí v tahu a prodloužení v porušení. Vzhled povrchu a lomové plochy byl hodnocen na základě snímků z optického a elektronového mikroskopu. DMA analýzou byly stanoveny teploty skelného přechodu recyklovaného vzorku. Složení laku bylo ověřeno FT-IR analýzou.
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Recyklace lakovaných polykarbonátových dílů
Navrátilová, Šárka ; Petruš, Josef (oponent) ; Kučera, František (vedoucí práce)
Práce se zabývá možnostmi recyklace lakovaných polykarbonátových dílů. Praktická část práce zkoumá vliv koncentrace laku, jemnosti mletí drti, extruze a kompatibilizátorů na vybrané vlastnosti mechanicky recyklovaných dílů. Tahovými zkouškami byla stanovena mez kluzu, maximální napětí v tahu a prodloužení v porušení. Vzhled povrchu a lomové plochy byl hodnocen na základě snímků z optického a elektronového mikroskopu. DMA analýzou byly stanoveny teploty skelného přechodu recyklovaného vzorku. Složení laku bylo ověřeno FT-IR analýzou.
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Technology of waste polylactide recyclation for 3D print
Kecíková, Alžbeta ; Tocháček, Jiří (oponent) ; Přikryl, Radek (vedoucí práce)
This bachelor thesis deals with the recycling of waste polylactide from the production process and its subsequent use in 3D printing. To optimize the recycling process of polylactic acid, it was recycled with the addition of various additives such as poly(3-hydroxybutyrate), talc, limestone and chain extenders Joncryl 4368-CS and Raschig Stabilizer 9000. These materials were also investigated with the addition of the acetyl tributyl citrate plasticizer. Samples of the mixtures were prepared on a twin-screw extruder and subsequently a filament was obtained using a single-screw extruder, which was then used for 3D printing by fused deposition modelling (FDM) technology. Temperature towers were printed to obtain optimal processing temperatures for 3D printing. The effect of the additives on the characteristic temperatures and the degree of crystallinity of the PLA was determined by differential scanning calorimetry. The effect of the processing on the molecular chain of selected samples was observed by gel permeation chromatography. Furthermore, in the experimental part of the bachelor thesis, the influence of additives on mechanical properties such as modulus of elasticity, tensile strength and elongation was investigated. The molecular weight was increased due to the chain extenders. Of the particle fillers for the PLA matrix, talc had better mechanical properties than limestone. The greatest effect of the plasticizer was in a mixture with poly(3-hydroxybutyrate).
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