Viscosity of dilute to moderately concentrated polymer solutions

Novel multi-stimuli responsive sodium alginate-grafted-poly(N-isopropylacrylamide) copolymers: II. Dilute solution properties

“…Later on, Eq. (3) was applied to various polymer-solvent systems (Bercea & Navard, 2000;Ioan, Simionescu, Neamtu, & Simionescu, 1986;Rao, 1993). Ghimici and Popescu (1998) testified that this equation could be used to describe the viscometric properties of a polyelectrolyte solution over a wide concentration range.…”

Hydrodynamic properties of some cationic amphiphilic polysaccharides in dilute and semi-dilute aqueous solutions

“…This problem can be solved either by addition of low-molar-mass electrolyte or by means of semi-empirical equa- Fuoss and Strauss (1948), Yang (2004), Rushing and Hester (2004), or Wolf (Eckelt, Knopf, & Wolf, 2008). Fedors' equation (Fedors, 1979) modified by Rao (Rao, 1993) and verified for neutral polymer, has been successfully extended to some polyelectrolytes in both water (Ghimici & Popescu, 1998;Ghimici & Nichifor, 2006) and water/organic solvent mixtures (Dragan & Ghimici, 2001;Ghimici & Avram, 2003;Ghimici & Nichifor, 2006). In the case of amphiphilic polymers, the meaning of the intrinsic viscosity can sometimes be doubtful since macromolecules can form aggregate (inter-or/and intramolecular), as we have already shown for these polymers using fluorescence techniques based on fluorescence probe or fluorescently labeled polymers (Nichifor, Lopes, et al, 2004).…”

Studies on the cationization of agarose

“…This problem could be overcome by the addition of low molecular weight polyelectrolytes, or by employing empirical equations such as those proposed by Fuoss and Strauss,25 or by Fedors 26 modified by Rao,27 applicable to describe the viscosity of diluted or moderately concentrated polymer solutions.…”