The empirical equation proposed by Lyons and Tobolsky (1) to describe the concentration dependence of zero-shear viscosity in polymer solutions was tested on a variety of data taken from the literature, covering different polymer-solvent systems, molecular weight, temperature, and the whole concentration range. This equation was fitted to each set ofexperimental viscosity-concentration data by a least squares method. The validity of this equation is verified. The dependence of the optimal values obtained for the three parameters intrinsic viscosity, [q], Huggins constant, k, and new empirical constant, b, on moIecular weight, temperature, and solvent is aIso discussed.
FITTING METHODqi is the experimental viscosity at concentrationci and N is the number of experimental determinations. The least The equation proposed by Lyons and Tobolsky reads: * We rrfer wily to zero-shear viscosity in this paper and will omit the notation "zero" throughout.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.