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Polylactide chemical recycling to Lactide
Kučerová, Eliška ; Pospíšilová, Aneta (referee) ; Figalla, Silvestr (advisor)
This diploma thesis deals with chemical recyclation polylactide to lactide. In the theory is summarized actual state of knowledge about chemical recyclation of polylactides, their properties, preparations a possibilities of characterization. Experimental part of work verify ethanolysis of PLA withthe samples of granulate, waste filaments and textiles. In the experimental work is suggested an optimalization of alcoholysis to direct yield of oligomer suitable for depolymerization to lactide. This method was verified for 5 different samples of PLA, which 4 of them was made of waste PLA. The time needed for depolymerization was evaluated and the effect of catalysis. Lactide and PLA recyclates was further analyzed by NMR, FTIR, DSC and GPC.
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The Study of Lactides Syntheses from Esters of Lactic Acide
Tomala, Libor ; Chamradová, Ivana (referee) ; Petrůj, Jaroslav (advisor)
This master thesis deals with the synthesis of lactide from lactic acid esters. The theoretical part focuses on the current understanding of technology of lactic acid, its alkyl esters and the cyclic lactic acid dimer - lactide, which is mainly used as a precursor for the synthesis of high moleculat weight biodegradable polylactide (PLA) and other copolymers. Experimental part is then focused on the synthesis of lactide from lactic acid alkyl esters, especially ethyl lactate. Examines the design of a suitable apparatus for this synthesis and the application of the most appropriate reaction conditions (temperature, pressure, catalysis) to optimize the preparation of the desired product. In the end, parameters of prepared lactide are characterized by using of various analytical techniques.
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The study of using lactic acid esters for preparing lactides and PLA
Vida, Mikuláš ; Figalla, Silvestr (referee) ; Petrůj, Jaroslav (advisor)
This diploma thesis deals with use of lactic acid esters for preparation of lactides and PLA. In the theoretical part, it has been processed literature review focus on manufacturing technologies and properties of lactic acid and its esters (especially ethyl ester and lactides). In the experimental part, it has been designed and realized functional laboratory apparatus for preparation of cyclic dimer of lactic acid – lactides. On this apparatus, there were carried out principal laboratory experiments leading to optimization of lactides yields using various catalysts.
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Polylactide chemical recycling to Lactide
Kučerová, Eliška ; Pospíšilová, Aneta (referee) ; Figalla, Silvestr (advisor)
This diploma thesis deals with chemical recyclation polylactide to lactide. In the theory is summarized actual state of knowledge about chemical recyclation of polylactides, their properties, preparations a possibilities of characterization. Experimental part of work verify ethanolysis of PLA withthe samples of granulate, waste filaments and textiles. In the experimental work is suggested an optimalization of alcoholysis to direct yield of oligomer suitable for depolymerization to lactide. This method was verified for 5 different samples of PLA, which 4 of them was made of waste PLA. The time needed for depolymerization was evaluated and the effect of catalysis. Lactide and PLA recyclates was further analyzed by NMR, FTIR, DSC and GPC.
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The Study of Lactides Syntheses from Esters of Lactic Acide
Tomala, Libor ; Chamradová, Ivana (referee) ; Petrůj, Jaroslav (advisor)
This master thesis deals with the synthesis of lactide from lactic acid esters. The theoretical part focuses on the current understanding of technology of lactic acid, its alkyl esters and the cyclic lactic acid dimer - lactide, which is mainly used as a precursor for the synthesis of high moleculat weight biodegradable polylactide (PLA) and other copolymers. Experimental part is then focused on the synthesis of lactide from lactic acid alkyl esters, especially ethyl lactate. Examines the design of a suitable apparatus for this synthesis and the application of the most appropriate reaction conditions (temperature, pressure, catalysis) to optimize the preparation of the desired product. In the end, parameters of prepared lactide are characterized by using of various analytical techniques.
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The study of using lactic acid esters for preparing lactides and PLA
Vida, Mikuláš ; Figalla, Silvestr (referee) ; Petrůj, Jaroslav (advisor)
This diploma thesis deals with use of lactic acid esters for preparation of lactides and PLA. In the theoretical part, it has been processed literature review focus on manufacturing technologies and properties of lactic acid and its esters (especially ethyl ester and lactides). In the experimental part, it has been designed and realized functional laboratory apparatus for preparation of cyclic dimer of lactic acid – lactides. On this apparatus, there were carried out principal laboratory experiments leading to optimization of lactides yields using various catalysts.
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