Volumetric and viscometric properties observed for the mixtures of DMF (N,N-dimethyl formamide) and other alcohols (butanol and 1-propanol)

A Novel Approach of Partial Derivatives to Estimate the Normal Boiling Temperature via Viscosity Arrhenius Behaviour in N,N-Dimethylformamide + Ethanol Fluid Systems

“…Based on the same experimental data of densities and absolute viscosities of (DMF + EtOH) binary fluid mixtures at atmospheric pressure and at five absolute temperatures from 303.15 to 323.15 K [1][2][3][4][5], some new approaches have been presented, for enhancing investigations of variation of Arrhenius parameters and the corresponding partial molar quantities against molar fraction composition.…”

“…It is observed that the partial molar quantity Ea 1 (x1) related to DMF regularly decreases from a maximum (about 16 kJ mol -1 ) to tend to a local minimum (about 4.5 kJ mol ) at (x1 = 0.55), then increases to reach the value of pure DMF (around 9.28 kJ mol -1 ). This behaviour supposes that at high dilution of DMF, the introduction of DMF into EtOH promotes the hetero-asso- ciation formation through multiple hydrogen bounds between the polar groups of unlike molecules till the molar fraction x1 ≈ 016 = 1/6 (1DMF:5EtOH) where there is a beginning of structure changing of EtOH [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

“…Arrhenius behaviour: The small number of experimental data are available the literature [1][2][3][4][5] and the necessity for of mathematical derivations manipulations, we have fitted with non-linear least-squares methods in fifth order polynomial with the help of available experimental data points [1][2][3][4][5] versus molar composition (x 1 ) of DMF at the five temperatures (303.15, 308.15, 313.15, 318.15 and 323.15) K. Using the expression of the optimal polynomials, we have added 18 interpolated points (x 1 ) evenly distributed throughout the full domain of composition (x 1 ) of DMF and then determinate the corresponding shear viscosity values (Table-1 ] for the five studied temperatures shows a nonlinear correlation regression better than R = 0.99995. It is observed that the relationship between the dynamic viscosity (η) and the absolute temperature (T) can be well adjusted with the Arrhenius type-equation as follows:…”

“…We are engaged in a research program of experimental data on thermodynamic and transport properties of binary mixtures [1][2][3][4][5] in lately suggested correlation equations.…”

“…Substantial structural effects are missing due to the lack of hydrogen bonding. Thus it acts as a protophilic aprotic solvent of large dipole moment (µ = 3.80 D) of molecules with a fairly high dielectric constant (ε = 36.71) at 298.15 K [1][2][3][4][5]. An ethanol molecule can interact with a N,N-dimethyl-formamide molecule in accordance with the better hydrogen bonding acceptor ability of its oxygen atom, resulting in packing and structural effects in the light of the critical interface of cohesive and frictional forces represented by friccohesity [28][29][30][31][32][33][34].…”