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Friction and adsorption properties of normal and high-oleic soybean oils

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Journal of the American Oil Chemists' Society

Abstract

The steel/steel boundary friction properties of soybean oil (SBO) and high-oleic soybean oil (HOSBO) are compared. HOSBO is significantly more saturated than SBO and more oxidatively stable. Changes in degree of unsaturation affect lateral interactions of adsorbate molecules, which in turn affects their adsorption and, hence, their boundary lubrication properties. To investigate this possibility, the free energies of adsorption (ΔG ads) of SBO, HOSBO, and methyl laurate (ML) were determined from the analysis of friction-derived adsorption isotherms using the Langmuir and Temkin adsorption models. The results showed a stronger adsorption for the vegetable oils than for ML, an indication of multiple interactions between the ester groups of the triglycerides and the steel surface. The result also showed no difference in the ΔG ads values of SBO and HOSBO obtained using either the Langmuir or Temkin models. This was interpreted as an indication of the lack of appreciable net lateral interaction between triglyceride adsorbates.

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Authors and Affiliations

  1. Biomaterials Processing Research Unit, NCAUR, ARS, USDA, 1815 N. University St., 61604, Peoria, IL

    G. Biresaw & C. J. Carriere

  2. Oil Chemical Research Unit, NCAUR, ARS, USDA, 61604, Peoria, Illinois

    S. Z. Erhan

  3. Department of Chemical Engineering, Pennsylvania State University, 16802, University Park, Pennsylvania

    A. Adhvaryu

Authors
  1. G. Biresaw
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  2. A. Adhvaryu
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  3. S. Z. Erhan
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  4. C. J. Carriere
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Correspondence to G. Biresaw.

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Biresaw, G., Adhvaryu, A., Erhan, S.Z. et al. Friction and adsorption properties of normal and high-oleic soybean oils. J Amer Oil Chem Soc 79, 53–58 (2002). https://doi.org/10.1007/s11746-002-0434-5

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  • DOI: https://doi.org/10.1007/s11746-002-0434-5

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