科研之友
微信
新浪微博
Facebook
分享链接
摘要
Density (rho) data for binary mixtures of ethyl benzoate (EB) with toluene (T), o-chlorotoluene (o-CT), m-chlorotoluene (m-CT) and p-chlorotoluene (p-CT) were measured as a function of mole fraction at temperatures 298.15,303.15,308.15 and 313.15 K Further, speeds of sound (u) and viscosity (eta) data for the same binary mixtures were also measured as a function of mole fraction at temperatures 303.15 and 313.15 K From the experimental data, excess volume (V-E), isentropic compressibility (kappa(s)), excess isentropic compressibility (kappa(E)(s)), deviation in viscosity (Delta eta), deviation in intermolecular free length (Delta L-f), deviation in acoustic impedance (Delta Z) and Gibb's free energy of activation of viscous flow (G*(E)) have been computed. The variations in these properties with composition for all the binary mixtures suggest that the dipole-dipole interactions, electron donor-acceptor interactions, n-pi interactions and charge-transfer complex formation between ethyl benzoate with toluene and isomeric chlorotoluenes were observed. Excess volume (V-E) and excess isentropic compressibilities (kappa(E)(s)) were found to be negative over the entire mole fraction range of ethyl benzoate indicating the presence of dipole-dipole interactions between the unlike molecules in the mixtures. The negative deviation in viscosity (Delta eta) values was attributed to mutual loss of specific interactions between unlike molecules. The excess/deviation parameters were compared with various theoretical models. The results were discussed in terms of molecular interactions present in these mixtures.
- 出版日期2014-9
