Studies on intermolecular interactions in binary mixtures of alkoxypropanols with ethyl tert -butyl ether at various temperatures

Abstract

Densities and viscosities at T = 293.15, 298.15 and 303.15 K in the binary liquid mixtures of ethyl tert-butyl ether (ETBE) with propylene glycol monomethyl ether (PM), dipropylene glycol monomethyl ether (DPM) and tripropylene glycol monomethyl ether (TPM) have been measured over the entire mixture compositions. These data have been used to compute the excess molar volumes (V E), the excess energies of activation for viscous flow ΔG* E, the deviations in the viscosity (Δη) from a mole fraction average and the Grunberg–Nissan interaction parameters (d 12). The values of V E, Δη, ΔG* E and d 12 are negative over the entire range of composition for all the studied binary mixtures. The changes of V E, Δη, ΔG* E and d 12 with variations in the composition and the chain-length of the alkyl groups in the alkoxypropanol molecules are discussed in terms of the intermolecular interactions.