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Use of polymers in road constructions
Klusková, Jana ; Komenda, Radek (referee) ; Stehlík, Dušan (advisor)
The diploma thesis deals with the use of recycled polymers in asphalt mixtures. In the theoretical part of the thesis there is discussed the global issue of plastic waste including the experience of foreign countries, where this technology has already been introducted and used. The practical part is devoted to the proposal of using recycled plastic in asphalt mixture, description of used laboratory tests and the evaluating the effect of low-density polyethylen (LDPE) on the asphalt mixture type AC. There were performed tensile strenght tests, water resistant tests and stiffness modulus tests in the laboratory (E). The output of this work is an evaluation of measured values, processing of results and their interpretation depending on the possible use of this technology in Czech republic.
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Degradation test of polymer material
Darebný, Tomáš ; Špinka, Jiří (referee) ; Vaněk, Jiří (advisor)
Basic knowledge of photovoltaic energy transformation, devices and materials, used in photovoltaics are summarized in this bachelor’s thesis. Sort of degradation factors of the photovoltaic panels and the norm ČSN EN 61215, are described there. The main purpose of this research is monitoring the change of volume and surface resistivity of selected covering materials. These covering materials were influenced of increased humidity.
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Evaluation of the influence of machining technologies on the analysis of the surface texture of technical plastics
Škeřík, Filip ; Dobrocký, David (referee) ; Sedlák, Josef (advisor)
The diploma thesis deals with the influence of machining technologies (turning, milling, grinding and polishing) on the surface texture of functional surfaces of selected materials from technical plastics. In the first part of the thesis there is a theoretical analysis of the possibilities of machining plastic materials. Furthermore, an analysis of the most commonly used parameters for evaluating the roughness of the machined surface and their effect on functionality is performed. The experimental part of the thesis describes samples preparation, analysis of measured data and subsequent evaluation with benefits for machinery industry.
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Clay minerals in polymeric materials
Zaťko, Petr ; Sluková, Michaela (referee) ; Krmíček, Lukáš (advisor)
The bachelor thesis deals with the clay minerals as fillers in polymer materials and their polymer/clay nanocomposites. The thesis brings an introduction to the structure of polymers and clay minerals and their application in polymer materials. The practical part of the thesis deals with testing the diffusivity of CO2 through the film made of recycled polyvinyl butyral with fillers Nanofil®5, Dellite® 67 and Cloisite® 93A and their comparison with reference samples from recycled PVB without added fillers and commercial films of extruded PVB.
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Application of Modern Technologies to Production of Prototype Form
Pospíšil, Josef ; Zemčík, Oskar (referee) ; Sedlák, Josef (advisor)
This Diploma Thesis deals with modern technologies such as 3D scanning, rapid prototyping and vacuum casting to production of prototype form. It considers advantages and disadvantages of the modern technologies compared to traditional process of manufacturing prototype form and economical contribution using the modern technologies. Part of the thesis considers a choice of suitable manufacturing technology of a particular product.
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Dielectric Absorption of Electroinsulating Materials
Pavlinský, Branislav ; Krbal, Michal (referee) ; Pelikán, Luděk (advisor)
This bachelor thesis deals with the basic physical principles of dielectrics as well as the description of the phenomenon of dielectric absorption. The work presents diagnostic methods that use this phenomenon, based on the events taking place in the dielectric after the connection of DC voltage. Furthermore, the work deals with diagnostic methods for determining the state of insulation of various high-voltage electrical equipment. The work also deals with the properties and parameters of electrical insulating materials - specifically polymers. We obtain these parameters using the mentioned diagnostic methods. By knowing these parameters, we achieve enough information about the insulation to determine its condition and prevent possible damage.
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Testing of polymeric materials under climatic conditions of Antarctica
Mičkal, Petr ; Sluková, Michaela (referee) ; Krmíček, Lukáš (advisor)
The bachelor's thesis generally deals with polymer materials and evaluates the possibility of testing their resistance to extreme climates of Antarctica. Described herein are various polymer materials, their characteristics, structure, properties and more thorough and detailed descriptions of selected polymers. The next section describes the basic types of degradation these polymers are exposed to, when facing the extreme conditions of the Antarctic climate. The practical part contains evaluations of tests made on the degraded polymer materials that were collected in Antarctica during the southern Antarctic season of 2013-2014 by Ing. Bc. Pavel Kapler, Ph.D, who is a superintendent at the Czech scientific station JG Mendel.
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Design of plastic pressure vessel
Rackovský, Daniel Milan ; Létal, Tomáš (referee) ; Pernica, Marek (advisor)
This bachelor thesis deals with the design of a pressure vessel made of plastic. The introductory part of the thesis contains the theoretical knowledge related to plastic materials. The next part consists of the selection of materials suitable for the design of the pressure vessel and a deeper analysis of their mechanical and other properties. The last part of the thesis deals with the calculation of the wall thickness of the plastic pressure vessel based on the theory of momentless diaphragm shells and the verification of the results using the finite element method, in Ansys Workbench 2022 R1. The analytical calculation is also compared with the calculation using the relationships given in ČSN EN 13445.
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Machining of polymericMaterials
Ondráček, Ivo ; Němec, Karel (referee) ; Molliková, Eva (advisor)
This bachelor’s thesis deals with the machining of polymeric materials and the major differences between the machining of metals and polymers or plastics. Introduction describes the basic elements in the history of the discovery and use of plastics. The thesis focuses on the basic division, further definitions and internal structure of the polymers. There are also discussed the most widely used machining technology and requirements for tools and materials. At the end of the work we are specified properties and selected types of plastic materials intended for processing. Practical informations were obtained during the visit to Brno company Belt Plast, Ltd.
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Engineering principles in the design of plastic products
Strnad, Jan ; Dvořáček, Jiří (referee) ; Svoboda, Petr (advisor)
This Bachelor's thesis deals with an overview study of constructional and technological principles of plastic products. It includes characteristics and basic division of plastics by methods of application and factors affecting their properties. Except that, technological principles or methods of manufacturing and designing plastic products are mentioned. Next part is focused on principles of designing constructional components, such as chimneys, ribbings, stiffeners and many others. Final part is discussion which summarises utilization of plastics, their economic aspect or demand and production of plastics in the world and in Europe.
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