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The scaling behaviour of the zero shear rate viscosity of semidiluteunentangled DNA solutions, in the double crossover regime driven by temperatureand concentration, is mapped out by systematic experiments. The viscosity isshown to have a power law dependence on the scaled concentration $c/c^*$, withan effective exponent that depends on the solvent quality parameter $z$. Thedetermination of the form of this universal crossover scaling function requiresthe estimation of the $\theta$ temperature of dilute DNA solutions in thepresence of excess salt, and the determination of the solvent quality parameterat any given molecular weight and temperature. The $\theta$ temperature isdetermined to be $T_\theta \approx 15^\circ$ C using static light scattering,and the solvent quality parameter has been determined by dynamic lightscattering.

Universal solvent quality crossover of the zero shear rate viscosity of semidilute DNA solutions