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Inorganic flame retardants and their application in composites
Bergmann, Ondřej ; Kučera, František (referee) ; Poláček, Petr (advisor)
In the first part of this bachelor thesis frequently used fire retardant additives are described as well as their mechanisms of action and the most common methods of flammability characterization. In the second experimental part the influence of two systems, consisting of a matrix and two fillers in different ratios, on viscosity, thermal stability and flammability were examined. Unsaturated polyester resin was used as the matrix. The first filler was always a fire retardant based on aluminium hydroxide, which was combined with the second filler based on either ammonium polyphosphate, or melamine polyphosphate. Viscosity of these samples was determined and casts for further analyses were made. Casts were analysed with thermogravimetric analysis and by flammability tests. Generally, with higher filler content the samples were more viscous, thermally degraded at lower temperatures and had better fire characteristics.
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New gel electrolytes
Sumka, Martin ; Jahn, Michal (referee) ; Sedlaříková, Marie (advisor)
This master´s thesis deals with the properties of gel polymer electrolytes, brief characteristics of other types of electrolytes and materials that are used for preparing polymer electrolytes. The thesis explains the use of the gel electrolytes in practice, the current conduction in the electrolytes and the properties of ionic liquids, and flame retardants. This thesis also focuses on methods of measurement of mechanical properties of gel polymer electrolytes. The practical part is focused on preparation of methacrylate gel electrolytes and their modifications with the use of flame retardant - triethyl phosphate (TEP) and ionic liquid - 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (Emim TFSI). In this part there are evaluations of their potential funcionality (potential window) and specific conductance conductivity using the method LSV (linear sweep voltammetry) and impedance spectroscopy. The practical part also includes a thermal analysis of selected samples by TGA, DTA and EGA methods.
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Inorganic flame retardants and their application in composites
Bergmann, Ondřej ; Kučera, František (referee) ; Poláček, Petr (advisor)
In the first part of this bachelor thesis frequently used fire retardant additives are described as well as their mechanisms of action and the most common methods of flammability characterization. In the second experimental part the influence of two systems, consisting of a matrix and two fillers in different ratios, on viscosity, thermal stability and flammability were examined. Unsaturated polyester resin was used as the matrix. The first filler was always a fire retardant based on aluminium hydroxide, which was combined with the second filler based on either ammonium polyphosphate, or melamine polyphosphate. Viscosity of these samples was determined and casts for further analyses were made. Casts were analysed with thermogravimetric analysis and by flammability tests. Generally, with higher filler content the samples were more viscous, thermally degraded at lower temperatures and had better fire characteristics.
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New gel electrolytes
Sumka, Martin ; Jahn, Michal (referee) ; Sedlaříková, Marie (advisor)
This master´s thesis deals with the properties of gel polymer electrolytes, brief characteristics of other types of electrolytes and materials that are used for preparing polymer electrolytes. The thesis explains the use of the gel electrolytes in practice, the current conduction in the electrolytes and the properties of ionic liquids, and flame retardants. This thesis also focuses on methods of measurement of mechanical properties of gel polymer electrolytes. The practical part is focused on preparation of methacrylate gel electrolytes and their modifications with the use of flame retardant - triethyl phosphate (TEP) and ionic liquid - 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (Emim TFSI). In this part there are evaluations of their potential funcionality (potential window) and specific conductance conductivity using the method LSV (linear sweep voltammetry) and impedance spectroscopy. The practical part also includes a thermal analysis of selected samples by TGA, DTA and EGA methods.
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