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- W2046155610 abstract "In this paper, the interaction between surfaces coated with grafted polymer is studied. The influence of free, nonadsorbed polymer on the interaction is described in some detail. A self-consistent field theory, based on the model for homopolymer adsorption of 19., 20., is used to take into account all possible conformations of terminally anchored and free polymer and to calculate the interaction between the two surfaces. For hard surfaces in the presence of free polymer, the attraction is determined only by the osmotic effect. In the case of hairy surfaces, the mixing of the grafted polymer layers gives an additional attractive contribution, because the hairs mix more easily with other hairs than with free polymer; this attraction is strongest at plate separations just below twice the hydrodynamic layer thickness. At small separations, the interaction between hairs becomes repulsive. The free energy of interaction shows a minimum as a function of the bulk volume fraction of free polymer. For infinitely large plates, the attraction is always stronger for higher chain lengths of free polymer. Increasing the mixing energy of grafted and free polymer (Xgf) increases the attraction drastically, whereas varying their solvency (Xf0, Xg0) has a much less pronounced effect. If no free polymer is present, the interaction becomes attractive when the solvency of the grafted chains becomes worse than the Θ condition." @default.
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- W2046155610 date "1990-07-01" @default.
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- W2046155610 title "Interaction between hairy surfaces and the effect of free polymer" @default.
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