Sitosterol ethoxylate

Figure 3.4 The temperature-concentration phase diagrams of BPS-m (m=5,10,20, and 30) with BmimPFj. The phase abbreviations are as follows micellar phase (1 ), discontinuous cubic liquid crystal phase (1 ), hexagonal liquid crystal phase (H ), lamellar liquid crystal phase (L ), lamellar gel phase (L ), reverse micellar phase (L ), ionic liquid phase (IL), and two-phase separation (II). The chemical structure of j0-sitosterol ethoxylates as a typical example of BPS-m is also shown in this figure. Reproduced from Sakai et al. [37] with permission from Japan Oil Chemists Society.

Figure 3.6 Sitosterol ethoxy ate with three ethoxylate groups.

More recently, the surfactant properties of ethoxylates prepared Ifom soya bean phytosterol (a mixture of sitosterol, stimasterol and campesterol in a 2 1 1 ratio) have been studied [39, 40]. The degree of ethoxylation largely determines the surfactant properties (Figure 3.7). 

---