Theory for Radii and Second Virial Coefficients. 1. Highly Charged Polyelectrolytes

摘要: We develop a theory for the dependence of radii gyration and second virial coefficients highly charged polyelectrolytes on molecular weight ionic strength. The is based using (i) Flory-Fisk 1 distribution chain conformations to describe elastic entropy (ii) rod model local intrachain repulsions full Poisson-Boltzmann equation. To overlap between two approaching chains, we go beyond rigid sphere Orofino Flory 2 assume chains can change coil size deform as ellipsoids avoid unfavorable interchain repulsions. Added salt weakens electrostatic repulsions, leading reduced radius coefficients. Without adjustable parameters this approach gives reasonable agreement with data T7 DNA, Col El poly(styrenesulfonate)s over decades