National Repository of Grey Literature 6 records found  Search took 0.01 seconds. 
Influence of catalysts on polyurethane formation
Chadima, David ; Petrůj, Jaroslav (referee) ; Kučera, František (advisor)
The bachelor thesis deals with the influence of catalysts on polyurethane formation. The theoretical part includes basic knowledge of polyurethane chemistry complemented by a literature review contains information about catalysis and reaction mechanism of polyurethane formation. In experimental part were studied effects of catalysts N,N,N',N' tetramethylethylenediamine, Stannous octoate, 1,4-Diazabicyclo[2.2.2]octane and Dibutyltin dilaurate at the rate of synthesis of the polyurethane resin. The measurement was based on measuring the time for which the reaction mixture reaches the maximum temperature. Effective concentrations of catalysts use were calculated. By additional measurement was performed simplified calculation of the activation energy for the demonstration of the effect of temperature on the observed reaction.
Organic tin compounds in the environment and the possibilities of their determination.
Fojt, Jakub ; Komendová, Renata (referee) ; Řezáčová, Veronika (advisor)
The aim of this thesis is elaboration literature search concerning the issue of organotin compounds in the environment. It mainly deals with use, properties and occurence of organotin in the environment and possible analytical ways to determine them. It also includes description of optimalized method to determination of trimethyltin chloride by capillary electrophoresis.
Determination of organic tin compounds in the environment
Fojt, Jakub ; Mravcová, Ludmila (referee) ; Řezáčová, Veronika (advisor)
Organotin compounds are one of the most produced and most used organometallic compounds. Some of these substances are endocrine disruptors, persistent organic polutants and their high toxic effects are observed. That’s why their presence in the environment caused by human activity could endanger many organisms. The aim of this thesis is summarize their properties and their occurrence in the environment. Then the quick, easy and relatively cheap method for determination of trialkyltin compounds in heavily poluted aquatic sediments using capillary zone electrophoresis is developed.
Determination of organic tin compounds in the environment
Fojt, Jakub ; Mravcová, Ludmila (referee) ; Řezáčová, Veronika (advisor)
Organotin compounds are one of the most produced and most used organometallic compounds. Some of these substances are endocrine disruptors, persistent organic polutants and their high toxic effects are observed. That’s why their presence in the environment caused by human activity could endanger many organisms. The aim of this thesis is summarize their properties and their occurrence in the environment. Then the quick, easy and relatively cheap method for determination of trialkyltin compounds in heavily poluted aquatic sediments using capillary zone electrophoresis is developed.
Organic tin compounds in the environment and the possibilities of their determination.
Fojt, Jakub ; Komendová, Renata (referee) ; Řezáčová, Veronika (advisor)
The aim of this thesis is elaboration literature search concerning the issue of organotin compounds in the environment. It mainly deals with use, properties and occurence of organotin in the environment and possible analytical ways to determine them. It also includes description of optimalized method to determination of trimethyltin chloride by capillary electrophoresis.
Influence of catalysts on polyurethane formation
Chadima, David ; Petrůj, Jaroslav (referee) ; Kučera, František (advisor)
The bachelor thesis deals with the influence of catalysts on polyurethane formation. The theoretical part includes basic knowledge of polyurethane chemistry complemented by a literature review contains information about catalysis and reaction mechanism of polyurethane formation. In experimental part were studied effects of catalysts N,N,N',N' tetramethylethylenediamine, Stannous octoate, 1,4-Diazabicyclo[2.2.2]octane and Dibutyltin dilaurate at the rate of synthesis of the polyurethane resin. The measurement was based on measuring the time for which the reaction mixture reaches the maximum temperature. Effective concentrations of catalysts use were calculated. By additional measurement was performed simplified calculation of the activation energy for the demonstration of the effect of temperature on the observed reaction.

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