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A Comparative Study of Xanthans by Light Scattering

  • E. A. Lange
Chapter

Abstract

Xanthan samples from four commercial manufacturers were studied in synthetic reservoir brines and a dilute NaCl solution. The samples included broth and powdered xanthan products. The weight-average molecular weight, Mw, for each sample was measured in the different solvents by low angle light scattering. Mw was not affected by the brine composition, and no evidence for increased aggregation in high-salinity, high-hardness brines was found. Mw varied from 4 × 106 g/mol to 12 × 106 g/mol. Variations in molecular weight were also observed among samples from one manufacturer. The translational diffusion coefficients of the xanthans could not be measured by a dynamic light scattering technique. Other modes of motion in addition to translational diffusion may have been detected at the 40° scattering angle as a direct result of the high polymer molecular weights.

Keywords

Apparent Diffusion Coefficient Virial Coefficient Translational Diffusion Scattered Light Intensity Translational Diffusion Coefficient 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1988

Authors and Affiliations

  • E. A. Lange
    • 1
  1. 1.Exxon Production Research CompanyHoustonUSA

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