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  • 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: Aliphatische Amine haben einen merklichen Einfluß auf die durch Mercaptide ausgelöste Polymerisation von Propylensulfid. Art und Größe dieses Effekts bei den mit Cadmiumbisallylmercaptid gestarteten Polymerisationen wurden bestimmt. Die Polymerisationsgeschwindigkeit wird durch primäre Amine und Diamine herabgesetzt, aber durch sekundäre und tertiäre Amine vergrößert. Primäre und sekundäre Amine verkleinern das Molekulargewicht des Polymeren, während tertiäre Amine wie erwartet keinen Einfluß darauf haben.
    Notes: Aliphatic amines have a marked influence on the polymerisation of propylene sulphide initiated by metal mercaptides. The nature and magnitude of this effect, for cadmium bis (allyl mercaptide) initiated polymerisations, has been determined. The rate of polymerisation is decreased by primary amines and diamines, but increased by secondary and tertiary amines. The molecular weight of the polymer is reduced by primary and secondary amines but is virtually unaffected by tertiary amines.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 14 (1970), S. 115-125 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: It has been shown that the resistance of certain polyethylene sulfides to thermal degradation can be markedly improved by the addition of small amounts of metal dithiocarbamates, thioureas, or diphenyl acetylene together with a suitable carbodiimide. The extent of degradation, as indicated by the concurrent changes in polymer melt viscosity in the temperature range 220°-250°C, was dramatically reduced, in particular, by a stabilizer comprised of 4% hexamethylenebis(tert-butyl)carbodiimide and 2% diphenylacetylene. At 250°C polyethylene sulfide (Dabco initiated) was stable in the melt viscometer for a period of 8-10 min and the resulting extrudate showed little sign of discoloration. The detailed mechanism of stabilizer action cannot be put forward at this stage because of uncertainty regarding the mode of polymer degradation which could occur by radical or ionic processes.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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