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

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Abstract

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.

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Acknowledgments

The author gratefully thanks BGRIMM for the financial support.

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Authors and Affiliations

  1. Natural Plant Gum Development Center, Beijing General Research Institute of Mining and Metallurgy, 100044, Beijing, China

    Meng Wu

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  1. Meng Wu
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Correspondence to Meng Wu.

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Wu, M. Shear-thinning and viscosity synergism in mixed solution of guar gum and its etherified derivatives. Polym. Bull. 63, 853–863 (2009). https://doi.org/10.1007/s00289-009-0127-y

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  • DOI: https://doi.org/10.1007/s00289-009-0127-y

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