Polymer Adsorption from Bulk Solution onto Planar Surfaces: Effect of Polymer Flexibility and Surface Attraction in Good Solvent

摘要: Adsorption of uncharged homopolymers various flexibilities in good solvent onto planar surfaces Lit polymer-surface interaction strengths have been investigated by employing a coarse-grained bead-spring polymer model using simulation techniques. The flexibility ranged from fully flexible to rod-like polymers, and the adsorption strength varied weak strong adsorption. Equilibrium properties were determined Monte Carlo simulations, processes Brownian dynamic simulations. In latter case, file initial systems composed Solution surface separated slab polymer-free solution. equilibrium interfacial analyzed monitoring bead density profiles, number adsorbed beads components radius gyration perpendicular parallel as well tail, loop, train statistics. Flexible polymers two layers, at ail increasing attraction increased become flatter, whereas ill single thin layer with nematic-like order. At stiffness fixed strength, increased, polymers. extension surface, fraction tails all displayed nontrivial maxima similar persistence length. analysis showed that was diffusion controlled, but soon became governed probability be captured attraction. flattened after attaching, their Final relaxation mechanism involved an fewer longer driven Surface pressure originating surrounding stiff much slower final state; this predominately constituting packing rocklike 2-dimensional nematic Furthermore, we defined integration time denoting for integrated into layer. Integration times residence bead-surface (Less)