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Novel polymeric materials for electromembrane processes
Galajdová, Barbora ; Pientka, Zbyněk (advisor) ; Slepička, Petr (referee) ; Abbrent Nováková, Sabina (referee)
Present study describes synthesis, characterizations and electrochemical properties of novel materials or novel approaches of preparation and their testing for suitability in industrial application. Work is divided into two main groups. First group is focused on preparation and characterization of ion-exchange membranes and second group is focused on preparation and characterization of ionic liquids. Prepared ion-exchange membranes are further split in two subgroups: a) Anion exchange membrane - synthesis and characterization of chloromethylene polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene copolymer, which was tested in water alkaline electrolysis b) Cation exchange membrane - synthesis and characterization of: i. poly(vinyl phosphonic acid-co-acrylonitrile), which was tested in fuel cells ii. polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene with sulfomethyl group, which was tested for use in microbial electrolysis Prepared ionic liquids are also divided into three groups based on the main function group: a) Imidazolium - ethyl methyl imidazolium phosphonic acid ethyl ester b) Phosphonium - methyl tributyl phosphonium bis (trifluoromethyl sulfonyl) imide c) Sulfonium - trimethyl sulfonium bis (trifluoromethyl sulfonyl) imide Ionic liquids were synthesized and...
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Novel materials for membrane gas separation
Giel, Verena ; Pientka, Zbyněk (advisor) ; Izák, Pavel (referee) ; Vopička, Ondřej (referee)
The implementation of polymer membranes in gas separation applications has been investigated to a great extent. Nevertheless, only a few types of polymers are used in commercial applications, disclosing the need for new materials with superior membrane performance to make membrane processes a more competitive technology over the conventional ones. Based on this context, this work focuses on the development of new polymeric membranes. Polyaniline (PANI), a multifaceted polymer that can change its structural properties upon various modification procedures, was chosen as membrane material. PANI membranes possess attractive O2/N2 selectivities, wherefore it is an interesting candidate for the use in gas separation applications, such as generation of oxygen-enriched air or inert gas generation. However, membranes made from neat PANI are suffering from brittleness and thus create leak paths through the membrane. Therefore PANI was blended with polybenzimidazole (PBI), a temperature stable polymer with good film-forming properties facilitating the preparation of thin, stable polymer films. Furthermore, several techniques were investigated including acid-doping, thermal treatment, and addition of titanate nanotubes (TiNTs) to enhance the separation properties. The materials that have been prepared are: 1)...
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Novel materials for membrane gas separation
Giel, Verena ; Pientka, Zbyněk (advisor) ; Izák, Pavel (referee) ; Vopička, Ondřej (referee)
The implementation of polymer membranes in gas separation applications has been investigated to a great extent. Nevertheless, only a few types of polymers are used in commercial applications, disclosing the need for new materials with superior membrane performance to make membrane processes a more competitive technology over the conventional ones. Based on this context, this work focuses on the development of new polymeric membranes. Polyaniline (PANI), a multifaceted polymer that can change its structural properties upon various modification procedures, was chosen as membrane material. PANI membranes possess attractive O2/N2 selectivities, wherefore it is an interesting candidate for the use in gas separation applications, such as generation of oxygen-enriched air or inert gas generation. However, membranes made from neat PANI are suffering from brittleness and thus create leak paths through the membrane. Therefore PANI was blended with polybenzimidazole (PBI), a temperature stable polymer with good film-forming properties facilitating the preparation of thin, stable polymer films. Furthermore, several techniques were investigated including acid-doping, thermal treatment, and addition of titanate nanotubes (TiNTs) to enhance the separation properties. The materials that have been prepared are: 1)...
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