The importance of Chain-Length dependent kinetics in Free-Radical polymerization: A preliminary guide

Johan P.A. Heuts, Gregory T. Russell, Gregory B. Smith, Alex M. van Herk

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    Samenvatting

    The effect of chain-length dependent propagation at short chain lengths on the observed kinetics in low conversion free-radical polymerization (frp) is investigated. It is shown that although the values of individual propagation rate coefficients quickly converge to the high chain length value (at chain lengths, i, of about 10), its effect on the average propagation rate coefficients, hkpi, in conventional frp may be noticeable in systems with an average degree of polymerization (DPn) of up to 100. Furthermore it is shown that, unless the system is significantly retarded, the chain-length dependence of the average termination rate coefficient, hkti, is not affected by the presence of chain-length dependent propagation and that there exists a simple (fairly general) scaling law between hkti and DPn. This latter scaling law is a good reflection of the dependence of the termination rate coefficient between two i-meric radicals, ki; it , on i. Although simple expressions seem to exist to describe the dependence of hkpi on DPn, the limited data available to date does not allow the generalization of these expressions.

    Originele taal-2Engels
    TitelRadical Polymerization
    SubtitelKinetics and Mechanism
    UitgeverijWiley-Blackwell
    Pagina's12-22
    Aantal pagina's11
    Volume248
    Uitgave1
    ISBN van elektronische versie9783527610860
    ISBN van geprinte versie9783527320561
    DOI's
    StatusGepubliceerd - 31 mei 2007

    Publicatie series

    NaamMacromolecular Symposia
    UitgeverijWiley-VCH Verlag
    ISSN van geprinte versie1022-1360

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