Abstract
Force versus extension behavior of flexible chains and semiflexible bottle-brush polymers adsorbed from a good solvent on a planar substrate is studied by Monte Carlo simulation of the bond fluctuation model. The properties of the polymers (fraction of adsorbed monomers, height of the free end of the macromolecule above the surface, gyration radius components parallel and perpendicular to the surface, etc.) are studied in full thermal equilibrium as well as out of equilibrium, varying the pulling speed over 3 orders of magnitude. The equilibrium extension vs force curve reveals that the transition force (where force-induced desorption occurs) increases with increasing side chain length N of the bottle brushes, while further extension is almost independent of N, and can be described by a model due to Odijk, in agreement with a recent experiment.
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