Dodecyl hexaoxyethylene glycol monoether

FIGURE 4 Phase diagram for the dodecyl hexaoxyethylene glycol monoether-water system. 

The phase behaviour of surfactants is best illustrated using nonionic surfactants of the poly(ethylene oxide) type. Figure 3.18 illustrates this with the phase diagram for the binary system, dodecyl hexaoxyethylene glycol monoether-water [14]. 

Fig. 3.18. Phase diagram for dodecyl hexaoxyethylene glycol monoether-water mixture.

Gel filtration techniques were first applied to solubilized systems by Herries et al. [57] and Borgstrom [58]. A development of this technique [59-64] involves tail analysis of the elution curves to obtain information not only about the elution behaviour of the solubilizates but also of the micelles themselves. Fig. 5.4 shows a typical elution curve of methylparaben solubilized in solutions of dodecyl-hexaoxyethylene glycol monoether, Ci2E6 The heights of the plateaux (S)t and (Z>)t correspond to the concentrations of C12E6 methylparaben, respectively, in the original sample. (D)m and (D)f are the concentrations of methylparaben solubilized in the micellar phase and of free methyl paraben in the aqueous phase, respectively. The low plateaux of the elution curve of corresponds to the... 

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