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Adsorption of semiflexible block copolymers on homogeneous surfaces

AutorCerdà, Joan J. ; Sintes, Tomàs ; Sumithra, K.
Fecha de publicación18-nov-2005
EditorAmerican Institute of Physics
CitaciónJournal of Chemical Physics 123 (20): 204703 (2005)
ResumenWe present the results of extensive numerical off-lattice Monte Carlo simulations of semiflexible block-copolymer chains adsorbed onto flat homogeneous surfaces. We have compared the behavior of several chain structures, such as homopolymers, diblocks, (AαBα) block copolymers, and random heteropolymers. In all the cases studied, we have found the adsorption process to be favored with an increase of the chain rigidity. Particularly, the adsorption of diblock structures becomes a two-step process characterized by two different adsorbing temperatures that depend on the chain stiffness κ, the chain length N, and the adsorbing energies ϵA and ϵB. This twofold adsorbing process changes to a single one for copolymers of reduced block size α. Each block of the stiff copolymer chain is found to satisfy the classical scaling laws for flexible chains, however, we found the scaling exponent ϕ to depend on the chain stiffness. The measurement of the radius of gyration exhibits a typical behavior of a polymer chain composed of N/lp blobs whose persistence length follows lp ∼ (κ/kBT)0.5 for large stiff chains.
Versión del editorhttp://link.aip.org/link/doi/10.1063/1.2101526
URIhttp://hdl.handle.net/10261/47598
DOI10.1063/1.2101526
ISSN0021-9606
E-ISSN1089-7690
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