Correlations and dynamics of polyelectrolyte solutions

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Abstract
The dynamics of polyelectrolyte solutions have been studied using a neutron spin echo spectrometer for wave vectors q around the maximum of the static structure factor (qm). The q dependent diffusion coefficient D(q) decreases sharply below q = qm, and is nearly constant above qm. All these features can be understood in terms of a new picture for the correlations, based on : i) the notion of a correlation hole, of diameter ξ = aØ-1/2 ; ii) locally rigid chains with a persistence length b = aØ-1 (where Ø is the polymer volume fraction and a the monomer size)

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