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The Polymerization and Copolymerization of e-caprolactone using Organic and Organometallic Catalysts
Smrčková, Markéta ; Vojtová, Lucy (referee) ; Hermanová, Soňa (advisor)
Aliphatic polyesters due to their both biodegradability and biocompatibility appear as a class of promising candidates for biomaterials. Nevertheless, their utilization in practical biomedical systems relies on reproducible synthesis of defined products with the absence of residual toxics giving rise to undesired immunological response in human host. The literature review aim at reporting on the initiators/catalytic systems and synthetic strategies of polycaprolactone preparation. The experimental objective of this work was to verify the presence of catalytic residues based on organic carbenes and organometallic complexes of aluminium in prepared polyesters. A series of polycaprolactone (PCL) samples was purified by re-precipitation in methanol at -10 °C. The presence of catalytic residues in PCL after each purification step was monitored by 1H NMR (Bruker Avance). The residual amount of aluminium was determined by means of Atomic Absorption Spectrometry (AAS) and Inductively Coupled Plasma Mass Spectrometry (ICP-MS).
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FRP for concrete reinforcement
Blahová, Aneta ; Vaněrek, Jan (referee) ; Bodnárová, Lenka (advisor)
The bachelor thesis deals with composite polymer FRP reinforcement. It descibes the method of manufacturing FRP reinforcements, which are their properties and what materials are used by manufacturers. Lists FRP reinforcement application in various structures. Also mentions the durability of FRP reinforcement in an aggressive environment and the cohesiveness of FRP reinforcement with concrete. The conclusion of the work is a proposal for experimental testing of a bond between FRP reinforcement and concrete.
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METHODS OF POLY-3-HYDROXYBUTYRATE EXTRACTION AND THEIR OPTIMIZATION
Pospíšilová, Aneta ; Plachá,, Daniela (referee) ; Kowalczuk, Marek (referee) ; Přikryl, Radek (advisor)
Poly-3-hydroxybutyrát (PHB) je biolodegradovatelný a biokompatibilní termoplastický polymer se širokou škálou potenciálních aplikací. Výroba PHB typicky zahrnuje fermentaci obnovitelných surovin bakteriemi. Získávání PHB z bakterií je však často náročné a neefektivní. V této práci jsou zkoumány a porovnány různé metody pro získání PHB, včetně digesce, mechanického rozrušení a extrakce. Jsou diskutovány různé optimalizační strategie, které lze použít ke zlepšení účinnosti izolace PHB. Experimentální a výsledková část popisuje snahy o zlepšení metod izolace, zejména kyselé a mýdlové digesce, které byly vybrány jako potenciálně ekonomické, bezpečné a šetrné k životnímu prostředí. Společně s našimi průmyslovými partnery jsme tyto technologie úspěšně otestovali v čtvrtprovozním měřítku a plánuje se další vývoj. Řešily se také možné aplikace a komercializace PHB. Bylo zjištěno, že PHB může nahradit některé mikroplasty v kosmetice a že toto úsilí má potenciál, protože přítomnost mikroplastů v běžných výrobcích je stále vysoká a na úrovni Evropské unie je plánován jejich zákaz. Dále byla studována tepelná stabilita PHB v závislosti na metodě získávání a byly vyvinuty dvě stabilizační metody, které umožnily použít PHB získaný digescí za použití mýdla v materiálových aplikacích.
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FRP for concrete reinforcement
Blahová, Aneta ; Vaněrek, Jan (referee) ; Bodnárová, Lenka (advisor)
The bachelor thesis deals with composite polymer FRP reinforcement. It descibes the method of manufacturing FRP reinforcements, which are their properties and what materials are used by manufacturers. Lists FRP reinforcement application in various structures. Also mentions the durability of FRP reinforcement in an aggressive environment and the cohesiveness of FRP reinforcement with concrete. The conclusion of the work is a proposal for experimental testing of a bond between FRP reinforcement and concrete.
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The overview and the evaluation of the technical specifications of transparent materials for the production of composite wood panels
Holub, Jan ; Böhm, Martin (advisor) ; Arnetová, Karolína (referee)
Work includes: general introduction to the components of the wood-based panels with a transparent layer, the history of their production. It includes requirements for individual components of composite wood panels and requirements for wood and other wood-based materials, which serve as reinforcement. Also mentions claims potting material, which serves as a matrix.
It includes a description of the technology of wood-based panels with a transparent layer. This paper introduces the most commonly used material serving as a matrix, their distinctive characteristics essential for the production of composite plates. Compares parameters resins based on polyester, polyurethane and epoxy resins and analyzes the choice of a suitable material for producing a composite board based on user requirements. Part of this work is to design materials for the manufacture of composite board with controlled light distribution.
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The Polymerization and Copolymerization of e-caprolactone using Organic and Organometallic Catalysts
Smrčková, Markéta ; Vojtová, Lucy (referee) ; Hermanová, Soňa (advisor)
Aliphatic polyesters due to their both biodegradability and biocompatibility appear as a class of promising candidates for biomaterials. Nevertheless, their utilization in practical biomedical systems relies on reproducible synthesis of defined products with the absence of residual toxics giving rise to undesired immunological response in human host. The literature review aim at reporting on the initiators/catalytic systems and synthetic strategies of polycaprolactone preparation. The experimental objective of this work was to verify the presence of catalytic residues based on organic carbenes and organometallic complexes of aluminium in prepared polyesters. A series of polycaprolactone (PCL) samples was purified by re-precipitation in methanol at -10 °C. The presence of catalytic residues in PCL after each purification step was monitored by 1H NMR (Bruker Avance). The residual amount of aluminium was determined by means of Atomic Absorption Spectrometry (AAS) and Inductively Coupled Plasma Mass Spectrometry (ICP-MS).
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Vliv pojiv nátěrových hmot na kvalitu pigmentové povrchové úpravy ve vysokém lesku
Vávra, Lukáš
The bachelor thesis deals with the binders coatings influence on the quality of pigment surface treatment in high gloss of materials based on wood and analyzing factors affecting required quality. Selection of proper binders coatings is the most important for final result. The part of the theoretical thesis covers the samples preparation, depending on base coat and base material used and surface treated in high gloss and subsequent assessment of their properties and comparison.
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