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The force-assisted desorption kinetics of a macromolecule from adhesivesurface is studied theoretically, using the notion of tensile (Pincus) blobs,as well as by means of Monte-Carlo (MC) and Molecular Dynamics (MD)simulations. We show that the change of detached monomers with time is governedby a differential equation which is equivalent to the nonlinear porous mediumequation (PME), employed widely in transport modeling of hydrogeologicalsystems. Depending on the pulling force and the strength of adsorption, threekinetic regimes can be distinguished: (i) "trumpet" (weak adsorption and smallpulling force), (ii) "stem-trumpet" (weak adsorption and moderate force), and(iii) "stem" (strong adsorption and large force). Interestingly, in all regimesthe number of desorbed beads $M(t)$, and the height of the first monomer (whichexperiences a pulling force) $R(t)$ above the surface follow an universalsquare-root-of-time law. Consequently, the total time of detachment $<\tau_d>$,scales with polymer length $N$ as $<\tau_d> \propto N^2$. Our main theoreticalconclusions are tested and found in agreement with data from extensive MC- andMD-simulations.

Polymer Detachment Kinetics from Adsorbing Surface: Theory, Simulation and Similarity to Infiltration into Porous Medium