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  • 1
    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: The quantitative determination of the r-values has been performed by non-linear optimum adaption of various selected copolymerization equations to the experimental values referring to low and high conversion with the aim of model selection. The two-parameter models discussed provide r-values being independent of comonomer composition and conversion. The three-parameter models, as the penultimate model, suggesting particularly reduced olefine concentration at the reaction site, can account for model deficiencies in the medium composition range of the monomer mixture.
    Notes: Die Quantifizierung der r-Werte erfolgt durch nichtlineare optimale Anpassung verschidenster ausgewählter Copolymerisationsgleichungen an die experimentellen Daten bei niedrigem und höherem Umsatz mit der Zielstellung einer Modellselektion. Alle diskutierten Zweiparametermodelle liefern r-Werte, die von der Comonomerzusammensetzung und vom Umsatz abhängig sind. Dreiparametermodelle, wie das „Penultimate Modell“, und besonders die Annahme der am Reaktionsort reduzierten Olefinkonzentration können den Modelldefekt in mittleren Zusammensetzungsbereichen der Monomermischung beheben.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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