TY - JOUR T1 - Intrinsic viscosity of aqueous solutions of carboxymethyl guar in the presence and in the absence of salt JF - Macromolecular Chemistry and Physics Y1 - 2008 A1 - Badiger, Manohar V. A1 - Gupta, Nivika R. A1 - Eckelt, John A1 - Wolf, Bernhard A. KW - Biopolymers KW - Carboxymethyl guar KW - intrinsic viscosity KW - polyelectrolyte KW - salt-free solutions AB -

Intrinsic viscosities were determined for solutions of CMG in pure water and 0.9 wt.-% aqueous NaCl. To avoid the 0/0-type extrapolation typical for Huggins plots, a new procedure was used. For CMG and pure water, this requires only two adjustable parameters: the specific hydrodynamic volume of the polymer in the limit of infinite dilution and a hydrodynamic interaction parameter. The intrinsic viscosity of CMG (no salt) at room temperature is 6 050 mL . g(-1); approximately half as large as that of Na-PSS of comparable molar mass. The ratio of the intrinsic viscosities with and without salt is approximate to 7 for CMG, as compared to >100 for Na-PSS. The reasons 1:5 5 for the different behaviors of the two types of polyelectrolytes are being discussed.

PB - WILEY-V C H VERLAG GMBH CY - PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY VL - 209 IS - 20 U3 - Foreign U4 - 2.495 ER -