An Examination of the Cloud Curves of Liquid-Liquid Immiscibility of Aqueous Solutions of Alkyl Polyoxyethylene Surfactants Using the SAFT-HS Approach with Transferable Parameters was written by Garcia-Lisbona, M. Nieves;Galindo, Amparo;Jackson, George;Burgess, Andrew N.. And the article was included in Journal of the American Chemical Society in 1998.Related Products of 112-59-4 The following contents are mentioned in the article:
The phase equilibrium of aqueous solutions of n-alkyl polyoxyethylene ethers (CiEj) are characterized by the presence of so-called cloud curves which represent the region of liquid-liquid immiscibility of two micellar solutions (one rich and one poor in surfactant). The systems exhibit a lower critical solution temperature (LCST), which denotes the lower limit of immiscibility; in some cases a complete closed-loop region with an upper critical solution temperature (UCST) is seen corresponding to re-entrant miscibility. In this case the behavior can be explained in terms of the competition between the incompatibility of water with the alkyl chain and the hydrogen bonding between water and the head groups. The authors have used a simplified version of the statistical associating fluid theory (SAFT), which is based on the thermodn. perturbation theory of Wertheim for associating fluids: the original SAFT-LJ equation of state treats the mols. as chains of Lennard-Jones segments while the simplified SAFT-HS equation treats mols. as chains of hard-sphere repulsive segments with van der Waals interactions. The water mols. are modeled as hard spheres with four associating sites to treat the hydrogen bonding; the dispersion forces are treated at the van der Waals mean-field level. The surfactant mols. are modeled as chains of hard-sphere segments with two or three bonding sites to treat the terminal hydroxyl group and an addnl. three sites per oxyethylene group; the dispersion forces are again treated at the mean-field level. For appropriate choices of the intermol. parameters, the SAFT-HS approach predicts cloud curves with both a UCST and an LCST. The critical temperatures and the extent of immiscibility are in very good agreement with the exptl. data. The authors have studied the transferability of the intermol. potential parameters for different members of the CiEj homologous series. Although the general trends are reproduced, slightly different values of the unlike dispersion forces have to be used for the various systems in order to provide quant. agreement with experiment This is not altogether surprising for such complex aqueous micellar solutions The authors have explored a relationship between the structure of the surfactant mol. and the value of the unlike intermol. potential parameter which enables one to predict the phase behavior of aqueous solutions of any member of the CiEj homologous series. This study involved multiple reactions and reactants, such as 2-(2-(Hexyloxy)ethoxy)ethanol (cas: 112-59-4Related Products of 112-59-4).
2-(2-(Hexyloxy)ethoxy)ethanol (cas: 112-59-4) belongs to ethers. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Polyesters are important plastics, with monomers linked by ester moieties. Esters are more polar than ethers but less polar than alcohols. They participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols. This ability to participate in hydrogen bonding confers some water-solubility.Related Products of 112-59-4
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem