Density, Refractive Indices, Molar Refractions, and Viscosities of Diethylene Glycol Dimethyl Ether-Water Solutions at 25° C.

Effects of hydration on the thermodynamic properties of aqueous ethylene glycol ether solutions

“…This is illustrated in figure 1 for mono-and diethylene glycol dimethyl ether, C 1 E 1 C 1 and C 1 E 2 C 1 . The present data clearly TABLE 4 Densities, q, and isobaric specific heat capacities, c p , of {water (1) + oligoethylene glycol dimethyl ethers (2)} mixtures at 298.15 K [26], (.) reference [30], (·) reference [36], (n) reference [37] and (,) reference [38].…”

“…reference [30], (·) reference [36], (n) reference [37] and (,) reference [38]. support the older determinations by Wallace and Mathews [26,37] rather than the more recent vibrating tube study by Dethlefsen and Hvidt [30] and Marchetti et al [38], even though the former was obtained by the less accurate [31] pycnometric method. The source of this discrepancy is unknown but it is noted that Wallace and Mathews distilled their ethers from sodium immediately prior to use whereas Dethlefsen and Hvidt used an untreated commercial sample with a stated purity of only 0.98 mole fraction.…”

Gibbs energies of transfer of the proton from water into mixtures of water with chain multiple ethers: Equilibria involving changes of solvation of the proton

“…A similar situation is found for V ¯2 À V o 2 and V ¯1 À V o 1 with the dimethyl ethers of diethylene glycol 18 and triethylene glycol. 19 We therefore assume that DG cav can be neglected also for these ethers.…”

“…x 2 for the extremum. Under these conditions, although sharp changes in the relative partial molar volume V ¯2 À V o 2 of S occur for hydroxy compounds [15][16][17] and dioxane, 18 V ¯1 À V o 1 remains relatively constant. It is assumed that DG cav for the spherical aqua-proton can be neglected compared with the large DG RE [3][4][5] in these largely aqueous media.…”

“…The differences found for ACN, DMF, and DMSO between DG o t (H + ) (TATB) and DG o t (H + )(K) in Table 3 39,53-55 may arise largely from the transmission of these differences found by Kim et al 45,46 )) (TATB) are difficult to calculate in the absence of detailed information about the arrangement of molecules in the mixture. For dioxane, with a negative DT ST 35 and a minimum in V ¯2 À V o 2 at x 2 $ 0.04 18 the effect of changes in solvent structure may only be small. However, with the alcohols significant differences occur 47 As + (TATB) varies in the regions where the very sharp minimum in V ¯2 À V o 2 occur, particularly with propan-2-ol and tert-butanol.…”