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Sorpce organických látek v nízkohustotní polyethylenové membráně
Friess, K. ; Machková, J. ; Šípek, M. ; Bartovská, P. ; Sysel, P. ; Izák, Pavel
This paper deals with the sorption of organic vapors (benzene, toluene, cyclohexane, hexane, heptane, acetone, methanol and chloroform) in low density polyethylene membrane BRALEN FB2-30 at 298 K. The sorption of all matters from liquid phase at the same temperature is also under study. The sorption apparatus with Mc Bain spiral quartz balance enabled to follow the sorption kinetics and from experimental data the polymer-solvent interaction parameters were calculated on the bases by Flory-Huggins theory.
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Vliv parciální neutralizace na katalytickou aktivitu ionexů
Holub, Ladislav ; Hanková, Libuše ; Jeřábek, Karel
Concentration of acid centers in a commercional ion exchanger catalyst was controlled by partial neutralization of sulfonic groups with various primary, secondary and tertiary amines of different molecular size. The efect of acid centres concentration on the activity of ion exchanger catalyst was tested by measurements of initial reaction rate of reesterification of ethyacetate with methanol in a CSTR-type reactor. There was found that the slope of the dependence of the catalyrtic activity on the degree of the resin neutralization strongly depends on the amine basicity.
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Funkční polymery s fotoelektrickou odezvou
Nešpůrek, Stanislav
Polymeric electronic devices have aroused increasing interest because of their potential low-cost applications, easy processing, possibility of modifications of their chemical structures and good compatibility with a variety of substrates. Many electrical and optical devices based on polymers can be mentioned: fuel cells, gas sensors, field-effect transistors, optical memories, information displays, hole/burning memories, lasers, etc.
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Funkční polymery pro aplikace v solárních článcích
Pfleger, Jiří ; Pavlík, Martin ; Hebestreit, N. ; Plieth, W.
Two alternative systems of polymer based solar cell structures were prepared: 1) based on the acceptor modified .pi.-conjugated polymer and 2) composed of a functional polymer - inorganic semiconductor nanocomposite, and their photoelectrical properties were tested. The simple electrodeposition method, providing a large area heterojunction distributed within a bulk of the polymer nanocomposite, was developed.
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