No (180)
Number of found documents:
180
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to
Structure and segmental dynamic as determinated by by solid-state NMR. Comparison with X-ray diffraction data
Brus, Jiří
2003 - Czech
3D structure and segmental dynamics of microcrystalline simavastatin were determined by multidimensional 13C CP/MAS NMR experiments at normal temperature. 3D struktura a segmentální dynamika mikrokrystalického simovastatinu při normální teplotě byly určeny pomocí multidimensionálních 13C CP/MAS NMR experimentů.
Keywords:
13C CP/MAS NMR; structure; segmental dynamics
Available at various institutes of the ASCR
Structure and segmental dynamic as determinated by by solid-state NMR. Comparison with X-ray diffraction data
3D structure and segmental dynamics of microcrystalline simavastatin were determined by multidimensional 13C CP/MAS NMR experiments at normal temperature.
Structural relaxation and their influence on glass transition temperature
Černošek, Z.; Holubová, J.; Černošková, Eva
2002 - Czech
Using of ,,StepScan" DSC method for measurement of structural relaxation and heat capacity. Použití metody ,,StepScan" DSC při měření strukturních relaxací a tepelné kapacity.
Keywords:
structural relaxation; glass transition; heat capacity; tepelná kapacita
Available at various institutes of the ASCR
Structural relaxation and their influence on glass transition temperature
Using of ,,StepScan" DSC method for measurement of structural relaxation and heat capacity.
Using of dynamic thermomechanical analysis for study of glasses
Černošková, Eva; Černošek, Z.; Holubová, J.
2002 - Czech
Keywords:
glass transition; DSC; DTMA; sklo; analýza
Available at various institutes of the ASCR
Using of dynamic thermomechanical analysis for study of glasses
Effect of storage conditions on ageing process of plastics
Kovářová, Jana; Špaček, V.; Řeháková, H.
2002 - Czech
Autooxidation, a chemical chain reaction, is an important part of various forms of degradation of most polymeric materials. During time and in relation to the particular conditions under which the polymers serve (temperature, air oxygen, sun irradiation, ozone, mechanical treatment, impurities etc.) undesirable and irreversible changes in their structure and useful properties take place.The necessity to use appropriate antioxidants and stabilizers for slowing down the degradation processes is mentioned. Významnou součástí různých forem degradace většiny polymerních materiálů je řetězová chemická reakce autooxidace. V průběhu času a v závislosti na konkrétních podmínkách, kterým jsou polymery vystaveny (teplota, vzdušný kyslík, sluneční záření, ozon, mechanické namáhání, nečistoty apod.), dochází k nežádoucím nevratným změnám jejich struktury a užitných vlastností. Zmíněna je nutnost použití vhodných antioxidantů a stabilizátorů ke zpomalení procesů degradace polymerů.
Keywords:
autooxidation; polymer degradation; stabilization
Available at various institutes of the ASCR
Effect of storage conditions on ageing process of plastics
Autooxidation, a chemical chain reaction, is an important part of various forms of degradation of most polymeric materials. During time and in relation to the particular conditions under which the ...
Characterization of ionically active membranes
Kůdela, Vlastimil; Richau, K.; Schauer, Jan
2002 - Czech
It has been shown that liquid junction potentials (LJP) are the cause of a systematic error of hydroxonium ions (protons) static transport numbers in membranes made from sulfonated poly(phenylene oxide) if LJP are calculated from concentration potentials measured by means of KCl filled electrodes. The remedy has been found in the use of wire electrodes of second kind like Ag/AgCl. Theory and results. Bylo prokázáno, že statická transportní čísla H3O+ (protonů) v membránách ze sulfonovaného poly(fenylénoxidu), vypočítaná z koncentračních potenciálů, jsou zatížena systematickou chybou, spočívající v kapalinových potenciálech, jestliže k měření byly použity elektrody plněné roztoky KCl. Řešení je nalezeno v použití drátových elektrod typu Ag/AgCl. Teorie a výsledky měření.
Keywords:
Transport numbers; Membranes for fuel cells; Concentration potential
Available at various institutes of the ASCR
Characterization of ionically active membranes
It has been shown that liquid junction potentials (LJP) are the cause of a systematic error of hydroxonium ions (protons) static transport numbers in membranes made from sulfonated poly(phenylene ...
Polymers 2002
Ulbrich, Karel
2002 - Czech
Abstracts of lectures and posters. Abstrakta přednášek a posterů.
Keywords:
polymers
Available at various institutes of the ASCR
Polymers 2002
Abstracts of lectures and posters.
Image processing in multiphase polymer systems
Holoubek, Jaroslav
2002 - Czech
Application of image analysis in the real and inverse space (in the Fourier space) are presented for some multiphase polymer systems. The analysis of the thresholded images of back scattered light from thick polymer material gives information about size and concentration of minor phase domains. Similarly, the phase separation and dissolution processes can be characterized by processing of light scattered patterns detected during time evolution. Je ilustrováno použití obrazové analýzy v reálném a inverzním (Fourierově) prostoru pro vybrané vícefázové polymerní systémy. Analýza intenzitně prahovaných obrazů zpětně rozptýleného světla na objemovém vzorku polymeru poskytuje informace o velikosti a koncentraci domén minoritní fáze. Podobně lze charakterizovat procesy fázové separace a rozpouštění fází digitálním zpracováním rozptylových obrazců získaných během časového vývoje těchto procesů.
Keywords:
image analysis; diffusive reflection; phase separation
Available at various institutes of the ASCR
Image processing in multiphase polymer systems
Application of image analysis in the real and inverse space (in the Fourier space) are presented for some multiphase polymer systems. The analysis of the thresholded images of back scattered light ...
Study of poly(ethylene oxide) melting by temperature-modulated DSC
Sikora, Antonín; Dolgoshey, V. B.; Baldrian, Josef; Kratochvíl, Jaroslav
2002 - Czech
Result of temperature-modulated DSC study of poly(ethyleneglycol) with molecular weight 3000. Výsledky studia tání oligomerního polyethylen oxidu o molekulové váze 3000 metodou teplotní modulované DSC.
Keywords:
Polyethylene oxide melting
Available at various institutes of the ASCR
Study of poly(ethylene oxide) melting by temperature-modulated DSC
Result of temperature-modulated DSC study of poly(ethyleneglycol) with molecular weight 3000.
Gas and vapour permeation through polymeric membranes
Pientka, Zbyněk
2002 - Czech
The new method for measurement of gases through swollen polymers is described. Results obtained on a homemade instrument are presented, showing that wate-swollen membranes of sulphonated poly(phenylene oxide) have lower permeability than dry membranes. Je popsána nová metoda měření transportu plynů přes nabobtnalé polymery. Výsledky získané na aparatuře postavené autory ukazují, že permeabilita membrán z sulfunovaného polyfenylenoxidu po nabobtnání vodou klesá.
Keywords:
transport through polymers - gas and vapours
Available at various institutes of the ASCR
Gas and vapour permeation through polymeric membranes
The new method for measurement of gases through swollen polymers is described. Results obtained on a homemade instrument are presented, showing that wate-swollen membranes of sulphonated ...
Polycationic graft copolymers for oligonucleotide transport to cells
Koňák, Čestmír; Dautzenberg, H.; Reschel, Tomáš; Zintchenko, A.; Ulbrich, Karel
2002 - Czech
Polycationic graft copolymers for oligonucleotide transport to cells. Polykationtové roubované kopolymery pro transport oligonukleotidů do buněk.
Keywords:
polycations; graft copolymers; oligonucleotide transport
Available at various institutes of the ASCR
Polycationic graft copolymers for oligonucleotide transport to cells
Polycationic graft copolymers for oligonucleotide transport to cells.
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