Dodecyl hexaoxyethylene glycol

Dodecyl hexaoxyethylene glycol, 24 129 Dodecyl mercaptan chain transfer,... 

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

It must be stated that A G° should be calculated using the cmc expressed as a mole fraction, as indicated by Equation (3.12). However, most cmc values quoted in the literature are given in mol dm and, in many cases, AG°-values have been quoted when the cmc was simply expressed in mol dm . Strictly speaking, this is incorrect, as AG° should be based on Xj rather than on C. The value of AG°, when the cmc is expressed in moldm is substantially different from the AG° value when the cmc is expressed in mole fraction. For example, for dodecyl hexaoxyethylene glycol the quoted cmc value is 8.7X10 moldm at 25 °C. Therefore,... 

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.

The intermolecular association of polymer-bound dodecyl groups is evidenced by an effect of a surfactant molecule added to polymer solutions. Hgure 7 compares relaxation time distributions for the copolymers with, X)d = 2.5 and 10 mol % at a 10.0 g/L polymer concentration in the presence of varying concentrations of n-dodecyl hexaoxyethylene glycol monc tiier (C12E6). In the cai of the copolymer with j >od =... 

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... 

Suzuku and Meguro et al. (] r ) have been studying the interaction of fluorocarbon and hydrocarbon surfactants by the use of the keto-enol tautomerism of benzoylacetoanilide(BZAA) as a probe and they found the existence of a mixed micelle between lithium fluorooctane sulfonate(LiFOS) and hexaoxyethylene glycol dodecyl ether(5ED). 

Muto et al. [252] measured pyrene fluorescence lifetime Tq and the ratio IiHt, of the intensities of the first vibronic and the third vibronic band of the monomeric pyrene. The pyrene fluorescence data revealed the existence of a single type of mixed micelle in solutions of LiDS-LiFOS, LiFOS-hexaoxyethylene glycol do-decyl ether, or LiFOS-octaoxyethylene glycol dodecyl ether mixtures. The lifetime and the intensity ratio of vibronic peaks have been used to determine the cmc of fluorinated surfactant micelles [253]. However, the solubility of pyrene in micelles of fluorinated surfactants is not adequate for determining the micelle aggregation number [253,254]. 

Tamori et al. [290] used electric birefringence to estimate the micellar size and shape in mixed-surfactant solutions containing hexaoxyethylene glycol dode-cyl ether and lithium perfluorooctanesulfonate or lithium dodecyl sulfate. 

---