Excess molar volumes and viscosities of binary mixtures of some polyethers with 1-propanol at 288·15, 298·15, and 308·15 K

Abstract

Excess molar volumes (VmE) and viscosities (η) have been measured as a function of composition for binary liquid mixtures of 1-propanol, C3H7OH, with diethylene glycol diethyl ether (bis(2-ethoxyethyl)ether), C2H5(OC2H 4)2OC2H5, and diethylene glycol dibutyl ether (bis(2-butoxyethyl)ether), C4H9(OC 2H4)2OC4H9, at 288·15, 298·15, and 308·15 K and at atmospheric pressure. The excess volume results included the following mixing quantities at all range of concentrations and at equimolar concentrations: α, volume expansivity; (∂VmE/∂T)P, and (∂H E/∂P)T at 298·15 K. The obtained results were then compared with the calculated values by using the Flory theory of liquid mixtures. The theory predicts the α values rather well, while the calculated values of (∂VmE/·T)P and (·HE/·P)T show variation with alkyl chain length of the polyether. The results are discussed in terms of order or disorder creation. From the viscosity data, deviations in viscosity (δη) have been calculated. These values are negative over the entire range of composition. The results for VmE, and δη are discussed in terms of interaction between components.