二甲苯异构体与八甲基环四硅氧烷二元混合物在298.15K的密度、表面张力和黏度

Densities,Surface Tensions and Viscosities of the Binary Mixtures of Xylene with Octamethylcyclotetrasiloxane at 298.15K

测定了八甲基环四硅氧烷(D4)分别与邻二甲苯、间二甲苯和对二甲苯组成的二元混合物在298.15K下全浓度范围内的密度、表面张力和黏度,计算了表面张力偏差和黏度偏差,并用Redlich-Kister多项式方程对实验数据进行了拟合。结果表明,上述3个二元体系的表面张力偏差和黏度偏差均为负值。

Densities, surface tensions and viscosities for binary mixtures of xylene with octamethylcyclotetrasiloxane （ D4 ）, include D4 ＋ o-xylene, ＋ m-xylene and ＋ p-xylene systems, were measured over the whole composition range at 298. 15 K. The surface tensions of the pure liquids and their mixtures are determined by the pendant drop method. The experimental data are used to calculate the surface tension deviations and viscosity deviations, respectively, which are fitted to the Redlich-Kister polynomial equation. The result shows that the surface tension deviations and viscosity deviations are negative for all the mixtures investigated. The values of surface tension deviations of equimolar solutions follow the order： o-xylene 〈 m-xylene 〈 p-xylene, whereas, the sequence of viscosity deviations is like that： p-xylene 〈 m-xylene 〈 o-xylene.