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A comparative study of the X-ray diffraction patterns and thermal transitions of metal soaps

  • Published:
Journal of the American Oil Chemists’ Society

Summary

X-ray diffraction patterns at room temperature for soaps of barium, calcium, and lithium were found to be characteristic for different soaps of the same cation. This is true not only for palmitates and stearates but also (with minor variations) for mixed soaps containing up to at least 50% oleate, for pure calcium oleate, and even for lithium 12-hydroxystearate.

Soaps of the same cation in mixtures approximating the composition of natural tallow fatty acids appear to form mixed crystals. The succession of phases formed on heating shows strongly the influence of the oleate in the mixture.

Calcium resinates appear to crystallize imperfectly but definitely with a “head to head” arrangment of the abietate radicals in contrast to the acids which give evidence of a head to tail arrangement.

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Authors
  1. Marjorie J. Vold
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  2. Robert D. Vold
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Additional information

This research was carried out as part of a project, “Phase Studies of Greases”, supported by the office of Naval Research; Contract Number N6onr-238-TO-2, NRO57057.

Contribution from the Depatment of Chemistry, University of Southern California.

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Vold, M.J., Vold, R.D. A comparative study of the X-ray diffraction patterns and thermal transitions of metal soaps. J Am Oil Chem Soc 26, 520–525 (1949). https://doi.org/10.1007/BF02822061

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  • DOI: https://doi.org/10.1007/BF02822061

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