The solvent activity of binary mixtures 1-propanol +poly (ethylene glycol) dimethyl ether 250 and 500 at T = 298.15 K

Thermodynamic properties of binary mixtures, 1-propanol + poly(ethylene glycol) dimethylether(PEGDME)250/ poly(ethylene glycol) dimethyl ether(PEGDME)500 were determined. The activity of 1-propanolwas measured in the poly (ethylene glycol) dimethyl ether 250 and 500 (PEGDME 250 and PEGDME 500) systems byuse of isopiestic method at 298.15 K. The effect of the polymer molar mass on the solvent activity and also vaporpressure were studied. To calculate the activity of the solvent, CaCl2 was used as isopiestic standard. The results showthat the activity of 1-propanol in PEGDME500 is much more than PEGDME250. The obtained solvent activity datawere correlated with the modified Flory-Huggins and Flory-Huggins activity equations.

کلیدواژه ها:

Poly(ethylene glycol) dimethyl ether ، Isopiestic method ، 1-Propanol activity ، vapor pressure