Persistence length of weakly charged polyelectrolytes with variable intrinsic stiffness
Max-Planck-Institut für Polymerforschung, Postfach 3184, D-55021 Mainz, Germany
Accepted: 20 March 1997
We present simulations of a basic model of weakly charged polyelectrolyte chains of variable intrinsic stiffness within the Debye-Hückel approximation. Starting from the sublinear dependence of the electrostatic persistence length Le on the screening parameter for flexible chains, the corresponding effective exponent y () crosses over to values up to 2 when the intrinsic persistence length L0 exceeds the electrostatic one Le. LP shows a pronounced minimum with increasing intrinsic stiffness due to the occurrence of two relevant length scales which influence each other. This makes the concept of a unique persistence length for these systems questionable.
PACS: 61.25.Hq – Macromolecular and polymer solutions; polymer melts; swelling / 36.20.-r – Macromolecules and polymer molecules / 87.15.-v – Molecular biophysics
© EDP Sciences, 1997