Intrinsic Viscosity of Aqueous Solutions of Carboxymethyl Guar in the Presence and in the Absence of Salt

✍ Scribed by Manohar V. Badiger; Nivika R. Gupta; John Eckelt; Bernhard A. Wolf

• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 271 KB
• Volume: 209
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.200800238

✦ Synopsis

Abstract

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 ≈7 for CMG, as compared to >100 for Na‐PSS. The reasons for the different behaviors of the two types of polyelectrolytes are being discussed.

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