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Hybrid structures based on montmorillonite/modified starch intercalate
Duchek, P.; Špírková, Milena
2010 - English
Intercalates based on several commercial cationized starches with degree of substitution D=0.04-0.17, and sodium montmorillonite were prepared. The XRD analyses of resulting organic/inorganic hybrids proved that modification in the starch structure leads to embedding the polycation into montmorillonite clay gallery. Lower degree of starch cationization results in bigger enlargement of the interlayer space in the hybrid structure.
Keywords:
organic/inorganic hybrides; montmorillonite
Available at various institutes of the ASCR
Hybrid structures based on montmorillonite/modified starch intercalate
Intercalates based on several commercial cationized starches with degree of substitution D=0.04-0.17, and sodium montmorillonite were prepared. The XRD analyses of resulting organic/inorganic hybrids ...
Novel nanocomposite materials for power engineering
Boček, J.; Matějka, Libor; Mentlík, V.
2010 - English
The epoxy-POSS nanocomposites were prepared and their electrical/dielectric and thermomechanical properties were determined. The mono- and octa-epoxyfunctionalized POSS (POSS,E1 and POSS,E8) were covalently incorporated in the epoxy network matrix DGEBA- 3,3’-dimethyl-4,4’-diaminocyclohexylmethane (Laromin C260) as pendant units or as polyhedral junctions, respectively. While the POSS junctions are well dispersed in the hybrid network DGEBA-Laromin-POSS,E8, the pendant POSS aggregate to form large crystalline POSS domains.
Keywords:
nanocomposite; epoxy resin; insulating system
Available at various institutes of the ASCR
Novel nanocomposite materials for power engineering
The epoxy-POSS nanocomposites were prepared and their electrical/dielectric and thermomechanical properties were determined. The mono- and octa-epoxyfunctionalized POSS (POSS,E1 and POSS,E8) were ...
Programme Booklet of 74th Prague Meeting on Macromolecules
Vlček, Petr; Sedláková, Zdeňka; Výprachtický, Drahomír
2010 - English
The conference addressed researchers dealing with all types of polymer synthesis, their characterization and applications, including design of tailored polymer materials for various use in technical and biological applications. The program composed of 7 key lectures presented by the top experts in the field, 27 special lectures and 47 poster communications presented prevailingly by students and young scientists. Totally, 81 people from 22 countries from allover the world attended the meeting.
Keywords:
controlled polymerization; modification of polymers; hybrid and multicomponent polymer systems
Available at various institutes of the ASCR
Programme Booklet of 74th Prague Meeting on Macromolecules
The conference addressed researchers dealing with all types of polymer synthesis, their characterization and applications, including design of tailored polymer materials for various use in technical ...
Book of Abstracts
Kotek, Jiří; Studenovská, Hana
2010 - English
The book of abstracts contains the summaries of all the contributions to the workshop Career in Polymers II organized in Prague, July 23-24, 2010 by the Institute of Macromolecular Chemistry AS CR, v.v.i. under the auspices of Central and East European Polymer Network.
Keywords:
polymer science; career in polymers; Central and East European Polymer Network
Available at various institutes of the ASCR
Book of Abstracts
The book of abstracts contains the summaries of all the contributions to the workshop Career in Polymers II organized in Prague, July 23-24, 2010 by the Institute of Macromolecular Chemistry AS CR, ...
Cation and anion exchangers from nanofibrous polystyrene for fast water treatment
Marek, J.; Beneš, Milan J.; Jelínek, L.
2009 - English
Strongly acidic sulfonovaný cation exchanger on polystyrene nanofibrous matrix (Nanospider TM technology) was prepared by simultaneous sulfonation and crosslinking. Weakly basic nanofibrous anion exchanger was prepared after transformation of sulfogroups to sulfochloride by reaction with ethylene diamine. Nanofibrous products were characterized by sorption capacity. They have sorption kinetic significantly faster in comparison with standard granular ion exchangers. Současnou sulfonací a síťováním byl připraven silně kyselý sulfonový katex na polystyrenové nanovláknité matrici (Nanospider TM technologie). Slabě bázický anex byl připraven po převedení sulfoskupin na sulfochlorid reakci s ethylen diaminem. Nanovláknité produkty byly charakterizovány pomocí sorpční kapacity. Mají kinetiku sorpce výrazně rychlejší než standardní sorbenty granulární.
Keywords:
polystyrene; nanofiber; ion exchanger
Available at various institutes of the ASCR
Cation and anion exchangers from nanofibrous polystyrene for fast water treatment
Strongly acidic sulfonovaný cation exchanger on polystyrene nanofibrous matrix (Nanospider TM technology) was prepared by simultaneous sulfonation and crosslinking. Weakly basic nanofibrous anion ...
Self-assembled nanostructures in copolymer blends: SAXS, SANS and TEM study
Holoubek, Jaroslav; Baldrian, Josef; Hromádková, Jiřina; Steinhart, Miloš
2009 - English
Phenomena associated with the phase behaviour and self-assembled nanostructures of three block copolymer systems have been studied by small-angle X-ray scattering (SAXS), small-angle neutron scattering (SANS) and transmision electron microscopy (TEM)
Keywords:
total hip replacement; polyethylene wear; aseptic loosening
Available at various institutes of the ASCR
Self-assembled nanostructures in copolymer blends: SAXS, SANS and TEM study
Phenomena associated with the phase behaviour and self-assembled nanostructures of three block copolymer systems have been studied by small-angle X-ray scattering (SAXS), small-angle neutron ...
Surface properties of polyethylene grafted by plasma
Novák, I.; Nedelčev, T.; Krupa, I.; Števiar, M.; Chodák, I.; Mosnáček, J.; Špírková, Milena; Chehimi, M. M.
2008 - English
The aim of the paper is an investigation of surface properties of the polyethylene modified by radio-frequency discharge plasma as well as of the polymer modified by plasma and subsequently grafted with alkoxyvinylsilanes. Cílem tohoto příspěvku je studium povrchových vlastností polyethylenu modifikovaného radiofrekvenčním plasmovým výbojem a plasmou modifikovaného polymeru s naroubovanými alkoxyvinylsilany.
Keywords:
polyethylene; surface properties
Available at various institutes of the ASCR
Surface properties of polyethylene grafted by plasma
The aim of the paper is an investigation of surface properties of the polyethylene modified by radio-frequency discharge plasma as well as of the polymer modified by plasma and subsequently grafted ...
Metal organophosphonates and their intercalation compounds as inorganic-organic hydrid materials and nanomaterials
Zima, Vítězslav; Svoboda, Jan; Melánová, Klára; Beneš, L.
2008 - English
We prepared several new phenylphosphonates and 4-carboxyphenylphosphonates of alkaline earth metals and copper and characterized them by powder X-ray diffraction, thermogravimetric analysis, energy-dispersive X-ray analysis, elemental analysis and infrared spectroscopy. For four of these compounds, their structure was determined from their powder X-ray diffraction patterns using an ab initio FOX program. The prepared alkaline-earth phenylphosphonates with general formula MeC6H5PO3yH2O (Me = Ca, Sr, Ba) were found to be suitable hosts for intercalation reactions. Připravili jsme několik nových fenylfosfonátů a 4-karboxyfenylfosfonátů kovů alkalických zemin a mědi a charakterizovali je pomocí práškové rentgenové difrakce, termogravimetrické analýzy, EDX, elem. analýzy a infračervené spektroskopie. Byla určena struktura čtyřech těchto sloučenin pomocí ab initio programu FOX z práškových rtg. dat. Připravené fenylfosfonáty alkalických kovů se ukázaly být vhodnými hostitelskými materiály pro interkalační reakce.
Keywords:
intercalation
Available at various institutes of the ASCR
Metal organophosphonates and their intercalation compounds as inorganic-organic hydrid materials and nanomaterials
We prepared several new phenylphosphonates and 4-carboxyphenylphosphonates of alkaline earth metals and copper and characterized them by powder X-ray diffraction, thermogravimetric analysis, ...
Synthesis of titanate nanotubes: influence of TiO2 modification on crystalline structure and morphology
Králová, Daniela; Šlouf, Miroslav; Kužel, R.
2008 - English
This work is focused on preparation of titanate nanotubes (Ti-NT) from various crystalline modifications of TiO2. Different source micro/nanopowders of TiO2 yielded Ti-NT with similar sizes, shapes and structures. Residual TiO2 particles in final Ti-NT suspensions were eliminated by modification of preparation procedure. Morphology and crystalline structure of both source TiO2 and final Ti-NT were investigated by means of electron microscopy, electron diffraction and X-ray diffraction. Předmětem studia byla syntéza titanátových nanotrubiček (Ti-NT) z různých krystalických modifikací TiO2. Při syntéze se vycházelo ze čtyř různých druhů TiO2 mikro- a nanoprášků. Úpravou postupu syntézy se podařilo zcela odstranit zbytkový TiO2 ve výsledném produktu. Morfologie a krystalická struktura zdrojových TiO2 prášků a finálních Ti-NT byla charakterizována pomocí elektronové mikroskopie, elektronové difrakce a difrakce rentgenova záření.
Keywords:
titanate nanotubes
Available at various institutes of the ASCR
Synthesis of titanate nanotubes: influence of TiO2 modification on crystalline structure and morphology
This work is focused on preparation of titanate nanotubes (Ti-NT) from various crystalline modifications of TiO2. Different source micro/nanopowders of TiO2 yielded Ti-NT with similar sizes, shapes ...
Recent Results of the Study of Phase Change Memory Materials
Frumar, M.; Wágner, T.; Přikryl, J.; Hromádko, L.; Frumarová, Božena; Němec, P.
2008 - English
Recent results of the study of phase change materials, of their structure, composition, properties and models fast crystallization and amorphization are discussed. Nedávné výsledky studia materiálů pro pamětí s fázovými změnami, jejich struktura, složení, vlastnosti a modely jejich rychlé krystalizace a amorfizace jsou diskutovány.
Keywords:
phase change memory
Available at various institutes of the ASCR
Recent Results of the Study of Phase Change Memory Materials
Recent results of the study of phase change materials, of their structure, composition, properties and models fast crystallization and amorphization are discussed....
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