Volume 75, Number 1, July 2006
|Page(s)||77 - 83|
|Section||Condensed matter: structural, mechanical and thermal properties|
|Published online||02 June 2006|
Dynamic scaling in dilute polymer solutions: The importance of dynamic correlations
Department of Chemical Engineering, Monash University Melbourne, VIC 3800, Australia
Accepted: 3 May 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
PACS: 61.25.Hq – Macromolecular and polymer solutions; swelling / 82.35.Lr – Physical properties of polymers / 83.10.Mj – Molecular dynamics, Brownian dynamics
© EDP Sciences, 2006
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