Polymer Bulletin

, 63:853

Shear-thinning and viscosity synergism in mixed solution of guar gum and its etherified derivatives


    • Natural Plant Gum Development CenterBeijing General Research Institute of Mining and Metallurgy
Original Paper

DOI: 10.1007/s00289-009-0127-y

Cite this article as:
Wu, M. Polym. Bull. (2009) 63: 853. doi:10.1007/s00289-009-0127-y


The flow properties of mixed solution of guar gum and carboxymethyl guar gum, including shear-thinning and viscosity synergism, have been studied at different mixed ratios, shear rates and temperatures using rheometer. The results show that addition of carboxymethyl guar gum enhances shear-thinning behavior and increases viscosity in guar gum solution at a given range of mixed ratios. The temperature-dependence of the mixed solution is markedly different from a single solution. The activation energy of blends with 50 and 75% of guar gum were determined to be 11.02 and 10.39 kJ mol−1, respectively, lower than that of a single solution. These results indicate that the network structure of viscous solution has been changed because carboxymethyl groups branched in galactomannans had changed the interaction among macromolecular chains.


GGCMGShear-thinningViscosity synergism

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© Springer-Verlag 2009