Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 340971
Title Surface forces induced by ideal equilibrium polymers
Author(s) Gucht, J. van der; Besseling, N.A.M.; Fleer, G.J.
Source Journal of Chemical Physics 119 (2003)15. - ISSN 0021-9606 - p. 8175 - 8188.
Department(s) Physical Chemistry and Colloid Science
Publication type Refereed Article in a scientific journal
Publication year 2003
Keyword(s) living polymers - supramolecular polymers - macromolecules - adsorption - chains - dynamics - lattice - dilute - model
Abstract The behavior of a dilute solution of ideal equilibrium (or "living") polymers confined between two surfaces and the effect on the surface forces are investigated theoretically. Exact analytical expressions are obtained for the concentration profile and the average length of chains in the gap, the adsorbed amount, and the disjoining pressure for chains with an arbitrary interaction with the surfaces. If the adsorption energy of the segments increases, the excess amount of segments in the gap and the average chain length increase and diverge continuously at a critical value of the adsorption energy which depends on the average length of the chains in the bulk and on the width of the gap. If the chain ends have no specific interaction with the surfaces, the equilibrium polymers cause an attraction between the surfaces, either via the depletion mechanism in the case of nonadsorbing polymers or via the formation of bridges in the case of adsorbing polymers. If only one of the functional groups adsorbs preferentially on the surface, the interaction becomes repulsive (if the main-chain segments do not adsorb), due to steric repulsion. On the other hand, if both functional groups adsorb preferentially, the interaction is attractive as a result of the formation of bridges with one adsorbed end on either surface. (C) 2003 American Institute of Physics.
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