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- W2013266025 abstract "Abstract Summary: This paper presents a systematic study of the compression of end‐anchored polymer layers by a variety of mechanisms. We treat layers in both good and Θ solvents, and in the range of polymer densities that is normally encountered in experiments. Our primary technique is numerical self‐consistent field (NSCF) theory. We compare the NSCF results for the different mechanisms with each other, and with those of the analytic SCF theory. For each mechanism, we calculate the density profiles, layer thicknesses, and free energies, all as functions of the degree of polymerization and surface coverage. The free energy and the deformation of each layer depend on the compression mechanism, and they can be very different from the ASCF theory. For example, the energy of compression can be as much as three times greater than the analytical SCF (ASCF) prediction, and it does not reduce to simple, universal functions of the reduced distance between the surfaces. The overall physical picture simplifies if the free energy is expressed in terms of the layer deformation, rather than the reduced surface separation. We also examine and quantify the interpenetration of layers, discuss why ASCF theory applies better to some compression mechanisms than others, and end with comments on the difficulties in extracting quantitative information from surface‐forces experiments. Comparisons of forces of compression in a good solvent for the three different systems, as functions of D / n b . The lower three curves are for σ * = 3, and the upper three are for σ * = 23. image Comparisons of forces of compression in a good solvent for the three different systems, as functions of D / n b . The lower three curves are for σ * = 3, and the upper three are for σ * = 23." @default.
- W2013266025 created "2016-06-24" @default.
- W2013266025 creator A5016239850 @default.
- W2013266025 creator A5022019518 @default.
- W2013266025 date "2005-02-10" @default.
- W2013266025 modified "2023-10-11" @default.
- W2013266025 title "End-Anchored Polymers: Compression by Different Mechanisms and Interpenetration of Apposing Layers" @default.
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- W2013266025 doi "https://doi.org/10.1002/mats.200400104" @default.
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