Viscosity of aqueous solutions of polysaccharides and their carboxylate derivatives

Authors

  • Hiroyasu Nomura,

    Corresponding author
    1. Department of Chemical Engineering, School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464, Japan
    • Department of Chemical Engineering, School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464, Japan
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  • Shinobu Koda,

    1. Department of Chemical Engineering, School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464, Japan
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  • Futoshi Hattori

    1. Department of Chemical Engineering, School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464, Japan
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Abstract

The viscosities of aqueous solutions of methyl cellulose, dextran, and their carboxymethyl derivatives were measured as functions of molecular weight and concentration. Furthermore, effects of ionic group and added salt on the viscosity of aqueous solutions of carboxymethyl derivatives were investigated. The viscosities of dextran and carboxymethyl dextran solutions did not show any shear stress dependence, but those of methyl and carboxymethyl cellulose solutions strongly depended on shear stress even at low concentrations. The results were discussed on the basis of the points of molecular structure and hydration and ionic interaction of a polymer chain in solutions.

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