DYNAMICAL SCALING ANOMALY FOR A 2-DIMENSIONAL POLYMER-CHAIN IN SOLUTION

Extensive molecular dynamics simulations indicate that for time scales t < tau(g), where tau(g) proportional to N-3v, the dynamical scaling exponent x = 2 + v(D)/v for a polymer chain in solution is anomalous ( x = 2) in two dimensions, contrary to the well known prediction (x = 3 ) of the Zimm model. A numerical solution of the 2D hydrodynamic Zimm model equations, which extends into the regime t > tau(g), supports th is value, suggesting a breakdown of dynamical scaling in 2D.