Abstract
The number average micellar molar masses of the series of nonionic surface active agents, C 12EO m ( m = 4, 5, 6, and 8) have been determined over the temperature range 0 to 70°C using freezing point and vapor pressure methods. These surfactants have a sharp cmc and the micelles were assumed to be monodisperse with a single aggregation number independent of concentration. The results were interpreted using McMillan-Mayer theory. The micellar aggregation numbers did not increase significantly with temperature. The aggregation numbers decrease as m increases in accordance with theories of micelle formation.
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