Volumetric properties of binary mixtures of o-cresol + poly(ethylene glycols) in the temperature range 288.15–308.15 K and atmospheric pressure

Densities, Viscosities, and Refractive Indices of Poly(ethylene glycol) 300 + 1,2-Ethanediol, 1,2-Propanediol, 1,3-Propanediol, 1,3-Butanediol, or 1,4-Butanediol Binary Liquid Mixtures

“…The structural contributions also cause V m E to become negative. This phenomenon can be attributed to the difference in the molar and free volumes of molecules and thus to formation of an intermediate location (geometric connections) of molecules with respect to each other. , In the studied mixtures, the formation of hydrogen bonding among PEG and alkanediols due to the existence of hydroxyl groups in them and also geometric connections between one molecule and the other produce a greater impaction of molecules, resulting in a negative excess volume of the binary solutions.…”

“…This phenomenon can be attributed to the difference in the molar and free volumes of molecules and thus to formation of an intermediate location (geometric connections) of molecules with respect to each other. 49,50 In the studied mixtures, the formation of hydrogen bonding among PEG and alkanediols due to the existence of hydroxyl groups in them and also geometric connections between one molecule and the other ) as a function of PEG molar fraction x 1 at 298.15 K for the systems: (a) solid tilted blue squares, (PEG300 + 1,2-ED) and solid orange boxes, (PEG200 + 1,2-ED); (b) solid tilted blue squares, (PEG300 + 1,4-BD) and solid orange boxes, (PEG200 + 1,4-BD); and (c) solid tilted blue squares, (PEG300 + 1,3-PD); solid orange boxes, (PEG200 + 1,3-PD) [6]; solid green triangles, (PEG400 + 1,3-PD); and purple crosses, (PEG200 + 1,3-PD) [26]; symbols refer to the experimental data, while the lines present the results calculated from eq 6. Figure 3.…”

Viscosity, Gibbs Free Energy, and Refractive Indices for Binary Mixtures of o-Cresol + Poly(ethylene glycols) at T = 288.15–308.15 K and 96.5 kPa

“…From the experimental viscosity values and the density values, published elsewhere, 17 the excess Gibbs free energy of activation of viscous flow ΔG* E was calculated using the following equation…”

“…23 ΔG* E values obtained in this work concurs with the negative excess molar volumes (ΔV m E ) for the same mixtures reported in our previous work. 17 The increasing ΔG* E from PEG 200 to PEG 400 can be assigned to the large size and cohesive energy difference between the two components of the liquid mixtures. Our calculated ΔG* E agrees in sign and magnitude with those reported by Bajićet al 14 for the binary mixtures of PEGs with pyridine and nicotine.…”

“…In our previous work, 17 we presented data on the volumetric properties of binary mixtures of o-cresol + PEG200, + PEG300,…”