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  • Polymer and Materials Science  (4)
  • 1980-1984  (4)
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Keywords
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 32 (1981), S. 14-18 
    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: Via empirical substituent parameters the 13C-NMR spectra of ten model compounds which are intermediates in the phenol-formaldehyde-reaction were calculated and interpreted. Comparing the shifts of these model compounds it is possible to assign the resonance ranges of structural features expected in phenolic resins and to achieve information on structure and reactions of some studied resins.
    Notes: Mit Hilfe empirischer Substituentenparameter wurden die 13C-NMR-Spektren von zehn Modellverbindungen, die als Zwischenprodukte bei der Phenol-Formaldehyd-Reaktion auftreten, berechnet und interpretiert. Durch vergleichende Betrachtung der chemischen Verschiebungen der Modellverbindungen ließen sich für die in Phenolharzen vermuteten Strukturelemente die Resonanzbereiche im Spektrum festlegen und erste Aussagen über den Aufbau und die Reaktionen einiger Harze treffen.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 366-369 
    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: Phenol-formaldehyde resins of resol type were characterized by an improved method of high-pressure liquid chromatography. Using the gradient elution technique it was possible to separate the components, which could be identified by comparison with a series of reference compounds.
    Notes: Mit Hilfe einer verbesserten Methode der Hochdruckflüssigchromatographie gelang die Charakterisierung von Phenol Formaldehyd-Harzen des Resoltyps. Die Anwendung der Gradientenelution führte zur Auftrennung in die einzelnen Komponenten, die durch Vergleich mit entsprechenden Referenzsubstanzen identifiziert wurden.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 32 (1981), S. 690-694 
    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: Via empirical substituent parameters the 13C-NMR spectra of chlorine substituted phenols, hydroxymethyl phenols and dihydroxydiphenyl methanes were calculated and interpreted. Comparing the chemical shifts of these model compounds it was possible to assign the resonance ranges of structural features expected in chlorophenol-formaldehyde resins. By this way the spectra of two resins are interpreted.
    Notes: Mit Hilfe empirischer Substituentenparameter wurden die 13C-NMR-Spektren einiger chlorsubstituierter Phenole, Hydroxymethylphenole und Dihydroxydiphenylmethane berechnet und interpretiert. Aus den chemischen Verschiebungen der Modellverbindungen ließen sich die Erwartungsbereiche für die in Chlorphenol-Formaldehyd-Harzen auftretenden Strukturelemente ableiten und damit die 13C-NMR-Spektren von zwei Modellharzen interpretieren.
    Additional Material: 2 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 34 (1983), S. 150-152 
    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: In reacting phenol and formaldehyde in the presence of basic catalysts also dimethylene ether structures are formed. The formation of ethers is favored by reaction temperatures below 80°C and by an excess of formaldehyde. Under reflux (98°C) and with a phenol to formaldehyde ratio of 1:1 ether bridges were found to be formed only with magnesium oxide as catalyst.
    Notes: Bei der Umsetzung von Phenol und Formaldehyd bilden sich auch in Gegenwart basischer Katalysatoren Dimethylenetherstrukturen. Reaktionstemperaturen unter 80°C sowie ein Überschuß an Formaldehyd begünstigen das Entstehen der Ether. Unter Rückflußbedingungen (98°C) und mit äquimolaren Phenol-Formaldehyd-Anteilen konnten nur in Magnesiumoxid-Resolen Ether nachgewiesen werden.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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