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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: Der Einfluß der Polymerisationsbedingungen auf die Polymerisationsgeschwindigkeit und das Molekulargewicht des erhaltenen Polymeren wurde an N-Dithiocarbonyläthoxycarbonyl-DL-alanin in Tolual, Dioxan, Nitrobenzol und Methylisobutylketon untersucht.In Dioxan, einem sehr brauchbaren Lösungsmittel, um Polyniere hohen Molekulargewichts zu erhalten, sinkt das Molekulargewicht mit wachsender Monomerkonzentration. Basische Substanzen beschleunigten die Polymerisationsgeschwindigkeit, erniedrigten aber das Molekulargewicht des erhaltenen Polymeren. Wasser beschleunigte die Polymerisationsgeschwindigkeit; die Erniedrigung des Molekulargewichts war nicht so groß.
    Notes: The effect of polymerization conditions on the rate of polymerization and molecular weights of resulting polymer was studied with N-dithiocarbonyl ethoxycarbonyl-DL-α-alanine. in toluenc, dioxane, nitrobenzene and methyl isobutyl ketone.In dioxane, which is a very suitable solvent to obtain high molecular weight polymers, the molecular weight of resulting polymer decreased with increasing monomer concentration. Basic substances accelerated the rate of polymerization, but decreased the molecular weight of resulting polymer. Water accelerated the rate of polymerization and the decrease of molecular weight was not so large.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
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