Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2000-07-31
Phys.Rev. E 62 (2000) 6949
Physics
Condensed Matter
Soft Condensed Matter
14 pages, 7 figures
Scientific paper
10.1103/PhysRevE.62.6949
We analyze the effect of polydispersity in the arm number on the effective interactions, structural correlations and the phase behavior of star polymers in a good solvent. The effective interaction potential between two star polymers with different arm numbers is derived using scaling theory. The resulting expression is tested against monomer-resolved molecular dynamics simulations. We find that the theoretical pair potential is in agreement with the simulation data in a much wider polydispersity range than other proposed potentials. We then use this pair potential as an input in a many-body theory to investigate polydispersity effects on the structural correlations and the phase diagram of dense star polymer solutions. In particular we find that a polydispersity of 10%, which is typical in experimental samples, does not significantly alter previous findings for the phase diagram of monodisperse solutions.
Ferber Christian von
Jusufi Arben
Likos Christos N.
Löwen Hartmut
Watzlawek Martin
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