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Interaction between Surfaces with Attached Poly(ethylene oxide) Chains
Physical Chemistry 1, Chemical Center, University of Lund, Lund, Sweden .
1992 (English)In: Macromolecules, ISSN 0024-9297, E-ISSN 1520-5835, Vol. 25, no 15, 3956-3970 p.Article in journal (Refereed) Published
Abstract [en]

The paper presents a self-consistent mean-field lattice theory of the Scheutjens-Fleer type where segments may adapt to temperature and the local environment by changing their distribution among internal states. Some new features are introduced in the theoretical treatment of incompressible systems, and it is demonstrated how the chemical potential may be calculated without reference to a bulk system. The theory is applied to make a qualitative prediction for the interaction between surfaces with grafted poly-(ethylene oxide), or PEO, chains. A simple two-state model for the PEO segments is used. The attractive force between the PEO-covered surfaces in water is predicted to be related to the temperature-dependent solubility of PEO in water. The contributions to the force are illustrated by simple examples. The attractive force does not change monotonically upon changing the graft density. At low coverages a strong bridging attraction is predicted if the surfaces are hydrophobic. As the surfaces become more polar, repulsion sets in at a larger separation and the overall attraction becomes less strong. A calculated, closed, solubility gap for a crude model of micelles of nonionic surfactants is presented.

Place, publisher, year, edition, pages
1992. Vol. 25, no 15, 3956-3970 p.
Keyword [en]
Colloid Chemistry - Mathematical Models, Polymers - Grafting, Surface Phenomena, Chemical Potential, Graft Density, Mean Field Lattice Theory, Nonionic Surfactants, Partition Function, Polyethylene Oxide Chains, Polymers
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:hig:diva-25647DOI: 10.1021/ma00041a019Scopus ID: 2-s2.0-0026890739OAI: oai:DiVA.org:hig-25647DiVA: diva2:1160803
Available from: 2017-11-28 Created: 2017-11-28 Last updated: 2017-11-28Bibliographically approved

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Björling, Mikael
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