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  • Polymer and Materials Science  (2)
  • Wiley-Blackwell  (2)
  • Springer
  • 1985-1989  (1)
  • 1980-1984  (1)
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  • Wiley-Blackwell  (2)
  • Springer
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 34 (1983), S. 105-108 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: 13C-NMR investigations were performed with cellobiose and two cellulose samples characterized by DP 35 and 285 in the mixed solvents N-methylmorpholine-N-oxide, dimethylsulfoxide/paraformaldehyde and calcium rhodanide/formaldehyde/water. In the calcium rhodanide/formaldehyde/water mixture, similar as in paraformaldehyde/DMSO, the methylation proceeds preferentially at the C6 atom, while no specific interaction was observed between the rhodanide ion and cellulose. In all mixed solvents investigated a signal, not having been described before, was observed in the 87 to 90 ppm range. The assignment is discussed with respect to formaldehyde-containing systems.
    Notes: 13C-NMR-spektroskopische Untersuchungen wurden an Cellobiose und an zwei Celluloseproben mit DP 35 und DP 285 in den Lösungsmittelsystemen N-Methylmorpholin/N-oxid, Dimethylsulfoxid/Paraformaldehyd und Calciumrhodanid/Formaldehyd/Wasser durchgeführt. Im Calciumrhodanid/Formaldehyd/Wasser-System erfolgt ähnlich wie im Paraformaldehyd/DMSO-System eine Methylolierung bevorzugt am C-Atom 6, während zwischen Rhodanidion und Cellulose offenbar keine spezifischen Wechselwirkungen auftreten. In allen drei Lösemittelsystemen wird ein bisher nicht beschriebenes Signal im Bereich zwischen 87 und 90 ppm beobachtet; Möglichkeiten einer Deutung werden für die formaldehydhaltigen Systeme diskutiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 36 (1985), S. 657-661 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: For further elucidation of the structure and mechanism of formation, samples of cellulose-sulfate semiesters prepared in different ways have been investigated by 13C-NMR-spectroscopy in aqueous (D2O) solution. With all samples obtained by dissolution of cellulose in the N2O4/DMF-system and simultaneous acylation with various reagents (SO2, NOSO4H, SO3 · DMF), a preferential substitution in the C-6-position was observed.
    Notes: Zur weiteren Klärung ihrer Struktur und Bildungsweise wurden unterschidlich hergestellte Cellulosesulfate mittels 13C-NMR-Spektroskopie in wäßriger Lösung (D2O) untersucht. Bei allen unter Auflösung der Cellulose im System N2O4/DMF mit unterschiedlichen Acrylierungsmitteln (SO2, NOSO4H, SO3-DMF) hergestellten Proben wurde eine bevorzugte Substitution in C-6-Stellung beobachtet.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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