Excess molar volumes
of binary
liquid mixtures of trichloroethylene,
C2Cl3H, and tetrachloroethylene, C2Cl4, with ethylene glycol monomethyl
ether, CH3OC2H4OH,
diethylene glycol dimethyl ether,
CH3(OC2H4)2OCH3,
and 1,4-dioxane, [(OC2H4)2], have
been measured as a function of composition at 298.15
K. The measurements were carried out with a continuous-dilution
dilatometer. The excess molar volumes
are positive over the entire range
of composition for the systems trichloroethylene + ethylene
glycol
monomethyl ether and tetrachloroethylene + ethylene glycol monomethyl
ether, +diethylene glycol
dimethyl ether, and +1,4-dioxane and change sign from positive to
negative for the remaining systems,
trichloroethylene + diethylene glycol dimethyl ether and
+1,4-dioxane. The measured excess volumes
have been compared to our previous published data with an effort to
assess the effects of replacing the
hydroxyl hydrogen by methyl groups, of inserting oxyethylene groups,
and of switching linear to cyclic
ethers. These results are fitted to the Redlich−Kister equation
to estimate the binary coefficients.