The solubility and the adsorbed amount (at the air-water interface) of ethylene glycol diesters (diacetate, dipropionate, dibutyrate, and divalerate) were measured by the surface tension method. As for ethylene glycol diesters, the relationship between the logarithm of the solubility and the surface area. She, of hydrophobic chains, which could maximally contact with water, was found to be linear, From the ratio of the slope of this straight line belonging to ethylene glycol diesters to the slope belonging to compounds which have a single hydrophobic chain, it was suggested that about seven-tenths of She in an ethylene glycol diester molecule contacts with water and the remainder does with an intramolecular hydrophobic chain. Moreover, from the adsorbed amount, it was suggested that a hydrophobic chain of a part of diacetate molecules, adsorbed at the interface, is present in a water.

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