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  • Metallverarbeitung  (1)
  • Polymer and Materials Science  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 298 (1979), S. 17-22 
    ISSN: 1618-2650
    Keywords: Best. von N-Nitrosoverbindungen in Kühlflüssigkeiten ; Massenspektrometrie/Chromatographie, Gas/Chromatographie, Dünnschicht/Polarographie, Differential-Puls ; Metallverarbeitung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The determination of an N-nitroso compound encountered in metal-working coolant fluids has been investigated using differential pulse polarography, gas chromatography and thin-layer chromatography. The only fluids found to contain an appreciable concentration (〉0.5 μg ml−1) of an N-nitroso compound were those which were formulated to contain high concentrations of di- and tri-ethanolamines and sodium nitrite. The N-nitroso compound isolated from these fluids has been investigated using gas chromatography/mass spectrometry and the evidence obtained from this and other studies suggest that the N-nitroso compound present in metal-working fluids which have been allowed to stand for 6–12 months is the mono-nitrite ester of N-nitrosodiethanolamine.
    Notes: Zusammenfassung Die Analysen wurden mit Hilfe der Differential-Puls-Polarographie, Gas-Chromatographie und Dünnschicht-Chromatographie durchgeführt. Nennenswerte Konzentrationen an N-Nitrosoverbindungen (〉0,5 μg/ml) wurden nur in solchen Kühlflüssigkeiten gefunden, die hohe Konzentrationen an Di- und Triethanolamin sowie Natriumnitrit enthielten. Die aus diesen Proben isolierte N-Nitrosoverbindung wurde gas-chromatographisch/massenspektrometrisch analysiert und es ergab sich zusammen mit anderen Untersuchungen, daß es sich dabei um den Mononitritester von N-Nitrosodiethanolamin handelte (die Flüssigkeiten wurden in diesem Fall 6–12 Monate stehen gelassen).
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 28 (1990), S. 1361-1376 
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The thermal decomposition of a series of four saturated and unsaturated C4 polyoxalates shows competing modes of depolymerization, fragmentation to polyenes and CO2, and crosslinking. These decompositions, which were studied by DSC and TGA, and intensively by EI- and CI-MS, could be rationalized in terms of the structure of the alcohol portions of the polyesters. The polymers were synthesized by ester interchange, which gave materials with DP values of 5-32.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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