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Mesophase formation in high molecular-weight xanthan solutions

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Abstract

After a short review of theoretical background on mesophase formation in polymer solutions, this paper describes the liquid crystal phase transition and the corresponding rheological properties for aqueous solutions of a high-molecularweight xanthan sample (M w ≈ 1.8 ⋅ 106). The formation of mesophases has been studied using polarizing microscopy and viscometry. The effects of the presence of salts, bacteria cells and proteins have been investigated. The variations in the viscosity, due to mesophase formation, are in qualitative agreement with the predictions of Matheson's theory, but the onset of the ordered phase occurs at very low polymer concentrations and the diphasic domain is much broader than predicted by thermodynamic models. These characteristics of the phase transition are related to the very high molecular weight of the sample studied and can be explained mainly by the effects of cooperative interactions between xanthan chains and of chain flexibility reducing translational entropy.

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Authors and Affiliations

  1. Laboratoire d'Hydrodynamique et de Mecanique Physique, ESPCI-CNRS UA 857-10, Rue Vauquelin, F-75271, Paris Cedex, France

    C. Allain

  2. Institut Français du Pétrole, 1-4, Avenue de Bois Préau, F-92500, Rueil-Malmaison, France

    J. Lecourtier & G. Chauveteau

Authors
  1. C. Allain
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  2. J. Lecourtier
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  3. G. Chauveteau
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Allain, C., Lecourtier, J. & Chauveteau, G. Mesophase formation in high molecular-weight xanthan solutions. Rheol Acta 27, 255–262 (1988). https://doi.org/10.1007/BF01329741

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  • DOI: https://doi.org/10.1007/BF01329741

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