含烷氧基乙醇的混合物热力学. XXVIII：2-苯氧基乙醇与选定烷烃的液-液平衡
Thermodynamics of mixtures containing alkoxyethanols. XXVIII: Liquid-liquid equilibria for 2-phenoxyethanol + selected alkanes
AI总结：
本研究用激光散射法测定2-苯氧基乙醇与多种烷烃的液-液平衡，发现UCST随烷烃类型和烷基尺寸变化，且芳香基增强分子间作用，临界指数符合Ising模型。
摘要：
采用激光散射技术的临界乳光法，测定了2-苯氧基乙醇（2PhEE）与庚烷、辛烷、环己烷、甲基环己烷或乙基环己烷体系的液-液平衡（LLE）共存曲线。所有曲线均呈现上临界溶液温度（UCST），顶部较为平坦，其对称性取决于混合物组分的相对大小。对于含直链烷烃的体系，UCST值高于含环烷烃的溶液。对于这些混合物，UCST随连接在环状部分上的烷基尺寸增大而升高。研究表明，当羟基醚含有芳香基团时，烷氧基乙醇分子间的相互作用更强。利用数据确定了序参数摩尔分数的临界指数。所得数值与Ising模型或重正化群理论提供的结果一致。
英文摘要：
The coexistence curves of the liquid-liquid equilibria (LLE) for systems of 2-phenoxyethanol (2PhEE) with heptane, octane, cyclohexane, methylcyclohexane or ethylcyclohexane have been determined by the method of the critical opalescence using a laser scattering technique. All the curves show an upper critical solution temperature (UCST), have a rather horizontal top and their symmetry depends on the relative size of the mixture compounds. UCST values are higher for systems with linear alkanes than for solutions including cyclic alkanes. For these mixtures, the UCST increases with the size of the alkyl group attached to the cyclic part of the molecule. It is shown that interactions between alkoxyethanol molecules are stronger when the hydroxyether contains an aromatic group. Data are used to determine the critical exponent for the order parameter mole fraction. Values obtained are consistent with those provided by the Ising model or by the renormalization group theory.
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