Dynamic scaling in dilute polymer solutions: The importance of dynamic correlationsP. Sunthar and J. Ravi Prakash
Department of Chemical Engineering, Monash University Melbourne, VIC 3800, Australia
received 16 January 2006; accepted in final form 3 May 2006
published online 2 June 2006
The swelling of the hydrodynamic radius of a polymer, obtained using Brownian dynamics simulations of the continuum Edwards model, is found to obey a crossover in the excluded-volume parameter z, which is significantly different from that observed for the swelling of the radius of gyration. It is shown that this difference arises due to contributions from dynamic correlations to the diffusivity, which are ignored in the commonly used definition of hydrodynamic radius based on the Kirkwood expression. Simulated values of are found to be in remarkable agreement with experimental measurements
61.25.Hq - Macromolecular and polymer solutions; swelling.
82.35.Lr - Physical properties of polymers.
83.10.Mj - Molecular dynamics, Brownian dynamics.
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