Water activities of ternary mixtures of poly(ethylene glycol), NaCl and water over the temperature range of 293.15K to 313.15K

Thermodynamic properties of aqueous polypropylene oxide 400 solutions from isopiestic measurements over a range of temperatures

“…Fig. 6 shows a comparison between the vapor pressure depression of PPO 400 (2) + H 2 O(1) and PEO 400 (2) + H 2 O(1) [27] as a function of polymers mass fractions at 303.15 K. As can be seen from this figure, for a given polymer mass fraction vapor pressure depression for PEO 400 (2) + H 2 O(1) system is larger than those for PPO 400 (2) + H 2 O(1) system. This would follow both from the fact that the PPO contains a greater pro- portion of hydrocarbon in its molecule and also from the steric effect of the side chain methyl groups in PPO which probably hinder hydrogen bonding between water molecules and the ether oxygen atoms.…”

“…It should, therefore, be useful to have information about vapor-liquid equilibria of the PPO and PEO with water in order to understand better and possibly predict the solution behavior of these polymers. There have been a number of studies on vapor-liquid equilibria of PEO in water [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27], while the corresponding information on PPO in water is more scarce and existing data were limitedly reported only for a very samll concentration range. Malcolm and Rowlinson [11] reported measurements of the vapor pressures of aqueous solutions of PPO 400 in the polymer mass fraction range 0.6-0.99 at 303.15 and 323.15 K. They only reported six experimantal data at each temperature.…”

Vapor-liquid equilibrium properties of sodium n-heptyl sulfonate in Water and in aqueous solutions of poly(ethylene glycol) at different temperatures

“…In fact, thermodynamic study of aqueous electrolyte solutions shows that the temperature has only minute effect on the water activity of aqueous electrolyte solutions. However, water activity of aqueous polymer solutions increases with increasing temperature [30][31][32][33]. Similar to the aqueous surfactant solutions, vapor pressure depression of both of binary aqueous electrolyte and aqueous polymer solutions increase with increasing temperature [30,33].…”

Activity coefficients of LiCl in (PEG 4000+water) at T=(288.15, 298.15, and 308.15)K

“…As well, they are a relevant property for the development of thermodynamic models and for the design, operation, and optimization of separation processes through ATPSs [2,3,6,7]. Additionally, this thermodynamic property, together with others, such as solvent activity, osmotic coefficient, Gibbs free energy of mixture, or transfer, are important for obtaining useful information about the structures and interactions that occur in these types of systems.…”