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  • Wiley-Blackwell  (137)
  • 1
    Electronic Resource
    Electronic Resource
    Interpolymer complex between poly(ethylene oxide) and poly(acrylic acid): Viscometric studies in THF-water mixturesDedicated to Prof. W. Kern on his 75th birthday (1982)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 183 (1982), S. 481-487 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Systematic studies were performed on interpolymer complex formation between Poly(acrylic acid) (PAA) and poly(ethylene oxide) (PEO) in THF-water mixtures of different compositions. Viscosity behaviour during complex formation in mixed solvents was found to be entirely different from that observed by other workers in aqueous and in pure organic solvents. The result are interpreted in terms of, (a) preferential solvation of the polymer, (b) Probable change in conformation of the polyelectrolyte moleculer. (c) association of complex molecules in a medium of low dielectric constant, and (d) expected disordering of bound water molecules around PEO by THF. Irrespective of solvent composition, interpolymer complex of PAA and PEO was always found to have 1:1 unit mole ratio.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1982.021830217
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  • 2
    Electronic Resource
    Electronic Resource
    Dissociation behaviour of some mixtures of synthetic phenolic oligomers in nonaqueous media (1978)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 179 (1978), S. 1031-1039 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Some phenolic oligomers of uniform structure, molecular weight, and with additional functional groups have been prepared by stepwise synthesis. These synthetic novolaks when mixed in various molecular proportions resemble p-cresol formaldehyde condensation polymers. A study has been made on the titration curves of the mixtures of synthetic compounds in nonaqueous media. A large number of breaks have been observed in the titration curves, and they occur in simple multiples of the calculated amount of base required to neutralize each acidic group in the various novolak molecules independently. An attempt has been made to interpret some of these observations in terms of intramolecular hydrogen bonding, ion-association, and homoconjugation.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1978.021790417
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  • 3
    Electronic Resource
    Electronic Resource
    Study of polymer-polymer complex formation involving phenolic copolymer, non-ionic polymers, and polyelectrolytes (1991)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 184 (1991), S. 99-110 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Aus einem phenolischen Copolymeren bekannter Zusammensetzung und verschiedenen nicht ionischen Homopolymeren (PVP, PEO, PVA) sowie Polyelektrolyten wie PAA und PEI wurden in Lösung Mehrkomponenten-Interpolymerkomplexe hergestellt. Die Bildung dieser Komplexe wurde mit verschiedenen Methoden, wie Viskosimetrie, Potentiometrie, Konduktometrie und IR-Spektroskopie untersucht. Es wird ein Schema zur Erklärung der Art der Wechselwirkung zwischen den verschiedenen Polymerkomponenten vorgeschlagen.
    Notes: Multicomponent interpolymer complexes have been prepared by interacting a phenolic copolymer of known composition with several non-ionic homopolymers, e.g., PVP, PEO, PVA and polyelectrolytes, such as PAA and PEI. The formation of these complexes has been studied by several techniques, such as viscometry, potentiometry, conductometry, and IR spectra. A scheme has been presented to explain the mode of interaction of the various component polymers.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1991.051840109
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  • 4
    Electronic Resource
    Electronic Resource
    Thermodynamic studies on some interpolymer interactions and stability of polycomplexes (1995)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 226 (1995), S. 13-22 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Stabilitätskonstanten und zugehörige thermodynamische Parameter (ΔH°, ΔS°) eines intermakromolekularen Komplexes aus Poly(acrylsäure-co-acrylamid), Poly(methacrylsäure-co-acrylamide) und Poly(N-vinylpyrrolidon) wurden mit bekannten Methoden bei verschiedenen Temperaturen bestimmt. Dabei wurde eine stufenweise Auflösung des Komplexes in Abhängigkeit von der Temperatur beobachtet, die mit den Stabilitätskonstanten und den thermodynamischen Parametern korreliert wurde.
    Notes: Stability constant and related thermodynamic parameters (ΔH° and ΔS°) of a multicomponent intermacromolecular complex consisting of poly(acrylic acid-coacrylamide), poly(methacrylic acid-co-acrylamide) and poly(N-vinylpyrrolidone) have been determined using known methods. A distinct stepwise disintegration of the complex at different temperatures has been observed, and this could be correlated with the stability constant and thermodynamic parameters calculated at various temperatures.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1995.052260102
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  • 5
    Electronic Resource
    Electronic Resource
    Study of multicomponent complexes between polycarboxylic acid, transition metal ions and non-ionic polymers (1990)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 181 (1990), S. 93-101 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Mehrkomponentige Komplexe eines typischen Polyelektrolyten wie Polyacrylsäure (PAA) mit nichtionogenen Polymeren (PVP and PEO) und Übergangsmetallionen (Cu(ll) und NI(II)) wurden hergestellt und mittels Viskosimetrie, Potentiometrie, Leitfähigkeitsmessungen und IR-Spektroskopie untersucht. Ein Schema, welches die Bildung dieser Komplexe erklärt, wird vorgeschlagen.
    Notes: Multicompoent complexes of a typical polyelectrolyte like poly(acrylic acid) (PAA) have been prepared by incorporating transition metal ions (e. g. Cu(ll) and Ni(ll)) and non-ionic polymers (e. g. PVP, PEO) in the polyelectrolyte chain in a definite sequence. The formation of these complexes has been studied by several techniques, such as viscometry, potentiometry, conductometry, and IR spectroscopy. A scheme is suggested to explain the mode of formation of such complexes.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1990.051810108
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  • 6
    Electronic Resource
    Electronic Resource
    Studien über Lactame (1969)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 102 (1969), S. 2129-2139 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus der starken Aktivierung des Methinwasserstoffs in den Halogenacetaminomalonaten und -phenylacetaten 4 durch eine N-[4-Nitro-phenyl]-Gruppe bei der Cyclisierung zu den β-Lactamen 5 sowie der Lage der CO-Bande der Amidgruppe in 5 und der Ringbeständigkeit wird auf Coplanarität des N-Nitrophenylrings mit den drei Valenzen des Stickstoffs in den Amiden 4 und Lactamen 5 geschlossen. In den N-[2-Chlor-4-nitro-phenyl]-und N-[2-Nitrophenyl]-halogenacetaminoestern 4h und i ist der Arylring aus der Ebene des sp2-Stickstoffs herausgedreht, begleitet von einer deutlichen Abnahme der Methinwasserstoff-Aktivierung.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19691020638
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  • 7
    Electronic Resource
    Electronic Resource
    Vogelin, ein neues Flavonoid-Glykosid aus Polygonum recumbens (Fam. Polygonaceae) (1971)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 3425-3428 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Vogelin, a New Flavonoid-Glycoside from Polygonum recumbens (Family Polygonaceae)Vogelin (1), a new flavonoid-glycoside, is isolated as pentaacetate (2) from Polygonum recumbens and is shown to have the structure vogeletin-4′-O-β-rhamnoside.
    Notes: Aus Polygonum recumbens wird Vogelin (1), ein neues Flavonoid-Glykosid, als Pentaacetat (2) isoliert und in der Struktur als Vogeletin-4′-O-β-rhamnosid aufgeklärt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19711041108
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  • 8
    Electronic Resource
    Electronic Resource
    Synthese von 2α-Methoxycarbonyl-A-nor-lupan (1968)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 101 (1968), S. 3255-3264 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2α-Methoxycarbonyl-A-nor-lupan (1b) wurde aus Lupeol synthetisiert. Einige Verbindungen, die mehr als eine Sauerstoff-Funktion im Ring A von Lupan tragen, wurden ebenfalls dargestellt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19681010933
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  • 9
    Electronic Resource
    Electronic Resource
    Molecular orbital studies on nucleoside antibiotics V. Conformation of pyrazofurins (1981)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 20 (1981), S. 129-138 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Conformational properties of pyrazofurins, which were previously designated as pyrazomycins in both β- and α-anomeric forms, have been investigated by the PCILO method. The results indicate that the most preferred conformation for β anomer is anti-gg, while that for α anomer is syn-gg when intramolecular hydrogen bonding between sugar and the base is allowed. However, in the absence such hydrogen bonding, which mimicks the situation in aqueous solution, both β and α pyrazofurins show exactly similar preference for anti-gg conformation. The biological significance of this result has been discussed. Further the β anomer is energetically more favorable than the α anomer. This result is in agreement with the experimental observations, which indicate that β pyrazofurin is more populated than a pyrazofurin in aqueous solution at room temperature.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560200711
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  • 10
    Electronic Resource
    Electronic Resource
    Molecular orbital studies on the structure of nucleoside analogs. IV. Conformation of 3-deazapurine nucleosides (1984)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 25 (1984), S. 743-752 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Conformational properties of 3-deazapurine nucleosides (namely, 3-deazaadenosine and 3-deazaguanosine) have been investigated by the PCILO method. Both C(2′)-endo and C(3′)-endo sugar puckers have been considered and the results indicate that the conformational preferences of these nucleoside analogs are quite different from those of their parent nucleosides adenosine and guanosine, respectively. This result has been correlated in terms of the biological inactivity of these nucleoside analogs.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560250413
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