1,3-丙二醇与水、乙醇二元混合体系超额体积

测定了常压下1,3-丙二醇-水和1,3-丙二醇-乙醇两个二元混合体系纯组分及混合液在328.15～348.15 K温度内全浓度范围的密度，计算了体系的超额摩尔体积等性质。两个二元混合体系的超额摩尔体积在所测定的温度和全浓度范围内均呈负偏差。体积数据说明1,3-丙二醇-水、乙醇混合体系中不同分子间的交叉缔合强于同分子间的自缔合，同时组分间分子大小的不对称产生填充效应。

Excess volumes of mixture for 1,3-propanediol+water/ethanol

The densities of pure components and the binary mixtures of (1,3-propanediol+water), (1,3-propanediol+ethanol) were measured at 328.15—348.15 K for the liquid region and under ambient pressure over the whole range of compositions.The excess molar volumes were calculated by using the measured experimental densities.The excess molar volumes were negative over the whole mole fraction range for the temperature range studied for the binary mixtures.Volumetric data indicated that the intermolecular interaction between different molecules was stronger than that between the same molecules and packing effect was resulted from different molecule sizes in the studied mixtures.