Studies on the Physicochemical Properties of Aluminum Soaps. III

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Bibliographic Information

Other Title
  • アルミニウムセッケンの物理化学的研究 (第3報)
  • ステアリン酸アルミニウムの組成とベンゼン溶液の構造粘性
  • Composition of Aluminum Stearate and Structural Viscosity of Benzene Solution

Abstract

Aluminum stearates of various compositions were prepared and the structural viscosity of their benzene solutions was measured. Structural viscosity increased with the increase of St/Al ratio when the ratio was smaller than 2 and decreased when the ratio was greater than 2. Intrinsic viscosity [ηN], calculated from ηr(1/Q→0), had a maximum at the St/Al ratio a little smaller than 2 and then decreased abruptly with the decrease of St/Al ratio, and was nearly equal to zero when St/Al was smaller than 1.8. In the range of 2-2.4 of St/Al, ratio [ηN] was nearly constant and decreased abruptly to zero with the approach of St/Al ratio to 2.5.<br>It has become clear that [ηN] did not depend on the lot of Al-St nor on the method of the extraction of free acid, but only on the composition of aluminum stearate. The value of k, calculated according to Staudinger's equation, (ln ηr)/c=[η]-k[η]2c(at 1/Q→O), remained nearly constant in the range of 1.9-2.5 of St/Al, and was highly different from that in other ranges. It has, therefore, been considered that the soaps whose St/Al ratio is 1.9-2.5 are different from the soaps of the other compositions in the degree of polymerization or in the structure of polymer.

Journal

  • YAKUGAKU ZASSHI

    YAKUGAKU ZASSHI 83 (12), 1137-1140, 1963

    The Pharmaceutical Society of Japan

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