Surfactants are widely used in industrial applications associated with several solvents. Therefore, it is worthy to know the nature of the molecular interactions present in surfactants and cosurfactant mixtures, whose thermodynamic and physical properties can provide important information from an academic and industrial viewpoint. In this work, density and viscosity data of binary mixtures of toluene + Igepal series (Igepal CO-520, Igepal CO-630, Igepal CO-720, or Igepal CA-720) were experimentally determined within a range of temperature T = 293.15–333.15 K and at an atmospheric pressure of 101.325 kPa. From these data, the following derivative properties have been evaluated: excess molar volume, viscosity deviation, thermal expansion coefficient, partial molar volume, and excess thermal expansion coefficient. It was observed that all these mixtures showed the prevalence of dispersion intermolecular forces.

中文翻译：

---

T = 293.15–333.15 K和大气压下，甲苯+ Igepal二元混合物（CO-520，CO-630，CO-720和CA-720）的粘度和密度

表面活性剂广泛用于与几种溶剂有关的工业应用中。因此，有必要了解表面活性剂和助表面活性剂混合物中存在的分子相互作用的性质，它们的热力学和物理性质可以从学术和工业角度提供重要信息。在这项工作中，在温度T的范围内通过实验确定了甲苯+ Igepal系列（Igepal CO-520，Igepal CO-630，Igepal CO-720或Igepal CA-720）二元混合物的密度和粘度数据。= 293.15–333.15 K，并且在101.325 kPa的大气压下。根据这些数据，评估了以下导数性质：过量摩尔体积，粘度偏差，热膨胀系数，部分摩尔体积和过量热膨胀系数。观察到所有这些混合物显示出分散的分子间力。