Abstract
The critical micelle concentrations (CMC's) of the three nonionic surface-active agents—oxyethylene oxypropylene polymers known as Pluronic L 62, Pluronic L 64, and Pluronic F68—were determined by the surface-tension method and two spectral absorption methods—one employing iodine and the other benzopurpurine 4B. The CMC's for these agents were found to be 2.40 Gm./dl., 2.20 Gm./dl., and 0.1 Gm./dl., respectively.
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