title: Dynamics of adsorbed polymers on attractive homogeneous surfaces.
abstract: Dynamic behaviors of polymer chains adsorbed on an attractive, homogeneous surface are studied by using dynamic Monte Carlo simulations. The translational diffusion coefficient Dxyparallel to the surface decreases as the intra-polymer attraction strength EPPor the polymer-surface attraction strength EPSincreases. The rotational relaxation time τRincreases with EPS, but the dependence of τRon EPPis dependent on the adsorption state of the polymer. We find that τRdecreases with increasing EPPfor a partially adsorbed polymer but it increases with EPPfor a fully adsorbed polymer. Scaling relations Dxy~ N-αand τR~ Nβare found for long polymers. The scaling exponent α is independent of EPSfor long polymers but increases with EPPfrom α = 1.06 at EPP= 0. While β ≈ 2.7 is also roughly independent of EPSfor the adsorbed polymer at EPP= 0, but β increases with EPSat EPP> 0. Moreover, we find that β always decreases with increasing EPP. Our results reveal different effects of the attractive surface on the diffusion and rotation of adsorbed polymers.
authors.affiliation: Department of Physics, Zhejiang University, Hangzhou 310027, China.
authors.forename: Qing-Hui
authors.initials: QH
authors.lastname: Yang
authors.affiliation: Department of Physics, Zhejiang University, Hangzhou 310027, China.|Collaborative Innovation Center of Advanced Microstructures, Nanjing, China.
authors.forename: Meng-Bo
authors.initials: MB
authors.lastname: Luo