Quantitative Theory of the Globule-to-Coil Transition. 2. Density-Density Correlation in a Globule and the Hydrodynamic Radius of a Macromolecule

A. Yu Grosberg, D. V. Kuznetsov

    Research output: Contribution to journalArticlepeer-review

    Abstract

    In this series of papers new results and a brief review of the current state of mean-field theories of the condensed globular state and of the globule-to-coil transition in the θ-region for a linear, homogeneous, noncharged macromolecule are presented. As a basis of our consideration, we use both Lifshitz's theory and interpolation Flory-type theory. Complete quantitative theoretical results are obtained and compared with experimental data. In this paper (the second in this series) the macromolecule properties determined by the pair density-density correlation function are considered. This function for a polymer globule is calculated in the framework of mean-field Lifshitz's theory. Using the correlation function, the hydrodynamic radius of a macromolecule is found in the Kirkwood approximation. The value of fluctuations of the macromolecule radius of gyration is calculated in the region of the globule-to-coil transition, which is connected with a sharp change in the fluctuational regime. The existence of a maximum of fluctuations in the transition region is shown.

    Original languageEnglish (US)
    Pages (from-to)1980-1990
    Number of pages11
    JournalMacromolecules
    Volume25
    Issue number7
    DOIs
    StatePublished - Mar 1 1992

    ASJC Scopus subject areas

    • Organic Chemistry
    • Polymers and Plastics
    • Inorganic Chemistry
    • Materials Chemistry

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