Displacement of polymers. I. Theory. Segmental adsorption energy from polymer desorption in binary solvents

M.A. Cohen Stuart, G.J. Fleer, J.M.H.M. Scheutjens

    Research output: Contribution to journalArticleAcademicpeer-review

    132 Citations (Scopus)

    Abstract

    The complete removal of high molecular weight polymers from adsorbent surfaces is proved to be possible. A novel method to desorb polymers through displacement by a low molecular weight component, a so called displacer, is shown. A critical displacer concentration may be defined, above which the polymer desorption is complete. This desorption method may be important for a number of practical applications. Theoretical analysis is employed to determine which parameters govern the desorption process. A simplified model leads to an analytical expression for the critical displacer concentration. Additional information on the displacement process (i.e., effects of polymer concentration, molecular weight, and solvent quality) is obtained from more elaborate model calculations. It is shown that it is possible to determine the segmental adsorption energy if displacement data are combined with adsorption data for the corresponding displacer, provided solvency effects are properly taken into account. ÿ
    Original languageEnglish
    Pages (from-to)515-525
    JournalJournal of Colloid and Interface Science
    Volume97
    DOIs
    Publication statusPublished - 1984

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