National Repository of Grey Literature 8 records found  Search took 0.00 seconds. 
Substitution of binder and filler of fire-resistant repair mortars using alternative raw materials
Gratclová, Kamila ; Dufka, Amos (referee) ; Bydžovský, Jiří (advisor)
The issue of protection and repair of reinforced concrete constructions affected by fire is very timely with respect to the dominant position of reinforced concrete as a building material. The aim is assessment of possibilities partial or complete substitution of the filler and the binder polymer composite materials intended for the repair of reinforced concrete constructions with higher resistance to fire.
Preparation and properties of thin layers of conjugated polyelectrolytes
Slunečková, Veronika ; Vohlídal, Jiří (advisor) ; Svoboda, Jan (referee)
The study shows strong influence of the conformation of the main chains of polythiophenes in solutions on their spectroscopic properties. The conformational changes affect strength of interactions between neighboring chains and lead to the formation of aggregates of stacked polythiophene chains. Stacked chains show red shift of the optical absorption and lead to visible vibronic structure of absorption bands. Multilayered systems prepared by periodic adsorption of the cationic and anionic polythiophene polyelectrolytes on various substrates show proportionality of the overall layer thickness to the number of coatings, which allows a control of the layer thickness. Adsorption of the conjugated polyelectrolytes on the anatase form of titanium dioxide show better penetration of the anionic polythiophene to porous anatase. The adsorption of polymer into the mesoporous structure is not complete: maximum adsorption of PTTA (poly(thiophene-3-ylacetic acid)) adsorbed on anatase do not correspond to the inner surface of mesoporous anatase. Alternating adsorption from the solutions of polythiophene with anionic and cationic side groups on mesoporous anatase allows preparation of the Graetzel-like photovoltaic cell provided that the adsorption process starts with the anionic polythiophene and the layers are deposited...
Substitution of binder and filler of fire-resistant repair mortars using alternative raw materials
Gratclová, Kamila ; Dufka, Amos (referee) ; Bydžovský, Jiří (advisor)
The issue of protection and repair of reinforced concrete constructions affected by fire is very timely with respect to the dominant position of reinforced concrete as a building material. The aim is assessment of possibilities partial or complete substitution of the filler and the binder polymer composite materials intended for the repair of reinforced concrete constructions with higher resistance to fire.
Carbonation mud from sugar industry as a filler
Šárka, E. ; Bubník, Z. ; Kotek, Jiří ; Kruliš, Zdeněk ; Picka, M. ; Milichovský, M.
Industrial application of carbonation mud is feasible especially in the area of plastic or paper recycling. Indeed, filling of recycled polymers or cartons by commercial calcium carbonate fillers is limited by economic aspects and the esthetic requirements for recycled materials (e.g. color) are adequately lower.
Carbonation mud from sugar industry as a filler in polymer composites
Kotek, Jiří ; Kruliš, Zdeněk ; Šárka, E.
The contribution is focused on application of carbonation mud, which is a by-product in a sugar factory, for property modification of polymers.
Matrix microhardness and morphology of composite materials
Lednický, František
Vickers microhardness well characterizes mechanical properties of irregular-shaped samples. Morphology is an important feature of polymer composite materials.
Study of supermolecular structure of polymers by light scattering methods
Holoubek, Jaroslav
Various optical techniques, especially light scattering methods, have been investigated as potential candidates for characterization of multiphase polymeric materials, i.e. to measure the size, shape and volume fraction of the minor phase and time evolution of morphology. Some supplementary information has been also obtained from model calculatios of dispersed-phase particles changes, time-resolved light scattering experiments and image analysis.
Kompozity polypropylen/osika/kapalný polybutadien: Maximalizace houževnatosti, pevnosti v tahu a modulu statistickým výběrem experimentů
Kokta, B. V. ; Fortelný, Ivan ; Kruliš, Zdeněk ; Horák, Zdeněk ; Michálková, Danuše
A systematic study of the effect of concentration of maleated polypropylene MAPP, dicumyl peroxide DCP, polyisobutadiene isocyanate PBNCO and fiber content on the mechanical properties of ASspen-PP composite was undertaken with the objective to protect or increase the impact strength without losing tensile strength reinforcement. Using STAGRAPHIC Plus, the central composite design it was possible to determine the optimum concentration of additives and to maximiye both the impact as well as tensile properties well above that of pure polypropylene.

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