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  • 1965-1969  (2)
  • 1
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: A method is described for the preparation of identical fractions of tritium marked and unmarked fractions of polymethacrylate of higher molecular weights. The labeling is done by TOH on polymethacrylic acid and does not change the molecular weight distribution.Further the influence of labeling by the method of WILZBACH on fractionated polymethacrylate is reported. The molecular weight distributions before and after the exposing to tritium gaz of 3 curie are determined. These data make it is possible to gain information concerning the number of bonds broken and of the position of the active hydrogen atoms in the polymer chain.
    Notes: Es wird eine Methode beschrieben, die es für Polymethacrylsäuremethylester auch höheren Molekulargewichtes erlaubt, identische Fraktionen in T-markierter und unmarkierter Form darzustellen. Die Markierung erfolgt an der Polymethacrylsäure mittels TOH und verändert die Molekulargewichtsverteilung nicht.Weiter wird der Einfluß einer Tritiummarkierung nach WILZBACH auf fraktionierte Polymethacrylsäuremethylester beschrieben. Aus den Molekulargewichtsverteilungen vor und nach der Inkubation mit 3 Curie werden Aufschlüsse über die Zahl der gesprengten Bindungen je Polymermolekül und über die Lage der aktiven Wasserstoffe in der Kette gewonnen.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    ISSN: 1365-2621
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary. The DTA (differential thermal analysis) cooling curves of fats are simpler than the melting curves because complicated effects due to polymorphism are not obtained. The cooling curves of some synthetic glycerides are presented. Fractions of defined glyceride composition are obtained from palm oil, cotton-seed oil and soya bean oil and examined by DTA. A number of other oils and hydrogenated oils are examined and the DTA curves interpreted in terms of their glyceride composition.
    Type of Medium: Electronic Resource
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