| 초록 |
Excess molar enthalpies, HE and excess molar volumes, VE over the whole range of compositions have been measured for binary mixtures 1,2-dichloropropane with ethylene glycol monomethyl ether acetate(EGMEA), ethylene glycol monoethyl ether acetate(EGEEA), and ethylene glycol monobutyl ether acetate(EGBEA) at 298.15K and atmospheric pressure using an isothermal microcalorimeter with a flow mixing cell and a digital vibrating-tube densimeter respectively. All the HE of the binary mixtures showed an exothermic effect(negative values) which increases with the increase in carbon number of the 2-alkoxyethanol acetate, showing minimum values varying from -374 Jmol-1(EGMEA) to -428 Jmol-1(EGBEA) around 0.54―0.56 mole fraction of 1,2-DCP. The VE of the mixtures has been shown positive for EGMEA, S-shaped for EGEEA, and negative for EGBEA. The experimental results of HE and VE values were fitted to the Redlich-Kister equation to correlate the composition dependence of both excess properties and a qualitative molecular interpretation is presented. |
