Open AccessDynamics of adsorbed polymers on attractive homogeneous surfaces
Author(s) -
Qinghui Yang,
MengBo Luo
Publication year - 2016
Publication title -
scientific reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.24
H-Index - 213
ISSN - 2045-2322
DOI - 10.1038/srep37156
Subject(s) - polymer , adsorption , exponent , scaling , diffusion , materials science , relaxation (psychology) , homogeneous , chemical physics , polymer adsorption , thermodynamics , polymer chemistry , chemistry , physics , composite material , psychology , social psychology , linguistics , philosophy , geometry , mathematics
Dynamic behaviors of polymer chains adsorbed on an attractive, homogeneous surface are studied by using dynamic Monte Carlo simulations. The translational diffusion coefficient D xy parallel to the surface decreases as the intra-polymer attraction strength E PP or the polymer-surface attraction strength E PS increases. The rotational relaxation time τ R increases with E PS , but the dependence of τ R on E PP is dependent on the adsorption state of the polymer. We find that τ R decreases with increasing E PP for a partially adsorbed polymer but it increases with E PP for a fully adsorbed polymer. Scaling relations D xy ~ N −α and τ R ~ N β are found for long polymers. The scaling exponent α is independent of E PS for long polymers but increases with E PP from α = 1.06 at E PP = 0. While β ≈ 2.7 is also roughly independent of E PS for the adsorbed polymer at E PP = 0, but β increases with E PS at E PP > 0. Moreover, we find that β always decreases with increasing E PP . Our results reveal different effects of the attractive surface on the diffusion and rotation of adsorbed polymers.