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- W2034673914 abstract "The adsorption of long-chain flexible macromolecules from dilute solution to a solid or other sharply defined substrate has a number of peculiar features. Most notable is the fact that not all polymer segments will seek to establish contact with the phase boundary. In one and the same macromolecule there will be some segments bonded to the surface and some sticking far into the solution. There is internal equilibrium and exchanges will occur between segments in free solution and segments attached to the surface. The segments in free solution can be seen to create a surface zone of fairly high polymer segment concentration. Since there is equilibrium, all macromolecules which have at least one segment in contact with the surface belong to the same class of adsorbed species. When, therefore, we speak of multilayer formation, we are defining a class of macromolecules which occupy locations close to the surface but which have not a single segment in contact with it. Such a concentrated surface zone would have to follow the ordinary rules of phase separation in polymer systems except that the presence of the first monolayer establishes a zone where the polymer concentration is maintained at a much higher level. The question is here investigated under what circumstances a preformed concentrated layer can attract the formation of a more extensive surface phase than is provided by the “monolayer,” even though the concentration of polymer in the bulk solution, from which adsorption is to occur, is below the critical concentration for phase separation and even though the solvent is better than critical. It is shown that multilayers are quite feasible within 20°C of the θ-point but the number of additional macromolecules has to be less than the number of those adsorbed." @default.
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- W2034673914 date "1972-01-01" @default.
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- W2034673914 title "Multilayer adsorption of macromolecules" @default.
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- W2034673914 doi "https://doi.org/10.1016/0021-9797(72)90237-8" @default.
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