Densities and surface tensions for binary systems of (1,2,4-trimethylbenzene or 1,3,5-trimethylbenzene + dimethyl carbonate or diethyl carbonate) have been measured under normal atmospheric pressure over the entire mole fraction range at 298.15 K and 313.15 K. The excess molar volumes and the surface tension deviation have been calculated. The excess molar volumes and the values of the surface tension deviation are fitted to the Redlich−Kister polynomial equation. The excess molar volumes for all the binary systems are positive over the whole composition range, and the surface tension deviations are negative.

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Densities for binary systems of [1,2,4-trimethylbenzene or 1,3,5-trimethylbenzene + ethylene glycol monomethyl ether (2-methoxyethanol) or ethylene glycol dimethyl ether (1,2-dimethoxyethane)] have been determined under normal atmospheric pressure at 298.15 K and 313.15 K over the entire mole fraction range. The excess molar volumes were calculated. Surface tensions of these binary systems have been measured at 298.15 K and 313.15 K by the pendant drop method, and the values of the surface tension deviation were also derived. The excess molar volumes and the values of the surface tension deviation are fitted to the Redlich−Kister polynomial equation. The excess molar volumes for all the binary systems are positive over the whole composition range, and their surface tension deviations are negative.

Densities and surface tensions for binary systems of (propyl acetate + o-xylene, + m-xylene, + p-xylene, + ethylbenzene) were measured under normal atmospheric pressure over the entire mole fraction range from (298.15 to 308.15) K. The excess molar volumes V  E and surface tension deviations δσ for the above systems were calculated and fitted to the Redlich−Kister polynomial equation. The V  E for the systems of (propyl acetate + m-xylene, + ethylbenzene) are nearly zero, but for the systems of (propyl acetate + o-xylene, + p-xylene) are negative. The δσ values are negative for all of the four systems. The V  E of the four systems hardly change with increasing temperature, but their absolute values of δσ decrease with increasing temperature.