1-戊醇+辛烷、1-戊醇+二丁醚及二丁醚+辛烷体系在不同温度下的介电常数与折射率测量
Dielectric and refractive index measurements for the systems 1-pentanol + octane, or + dibutyl ether or for dibutyl ether + octane at different temperatures
AI总结：
本研究测量了三种混合物的介电常数和折射率，结合密度数据利用Kirkwood-Fröhlich方程分析，发现1-戊醇在辛烷中形成环状物种，而在二丁醚中被破坏，二丁醚+辛烷无显著结构，经验公式可良好关联折射率。
摘要：
在(288.15-308.15) K和(293.15-303.15) K温度下，分别测量了1-戊醇+辛烷、1-戊醇+二丁醚及二丁醚+辛烷混合物的相对介电常数ε_r和折射率n_D。这些数据与文献中已有的密度测量值结合，根据Kirkwood-Fröhlich方程确定了所研究体系的相关系数g_K。结果表明，当1-戊醇与辛烷混合时，在低浓度下环状1-戊醇物种占主导。在二丁醚混合物中，这些物种被更活泼的氧杂烷分子大量破坏，这与量热数据一致。二丁醚+辛烷体系未显示出有意义的结构。这些结论通过摩尔极化值和ε_r的温度依赖性得到证实。Lorentz-Lorenz、Wiener、Heller、Gladstone-Dale和Newton经验表达式能很好地关联n_D数据。
英文摘要：
Relative permittivities, $\varepsilon_{r}$, and refractive indixes, $n_{D}$, have been measured at (288.15-308.15) K and (293.15-303.15) K, respectively, for the mixtures 1-pentanol + octane, or + dibutyl ether and dibutyl ether + octane. These data have been used, together with density measurements available in the literature, to determine the correlation factor, $g_{K}$, for the studied systems according to the Kirkwood-Fröhlich equations. Results show that the existence of cyclic species of 1-pentanol are predominant at low concentrations of this alkanol when is mixed with octane. These species are broken in large extent by the more active molecules of oxaalkane in the dibutyl ether mixtures, which is in agreement with calorimetric data. The dibutyl ether + octane system does not show meaningful structure. These conclusions are confirmed by values of the molar polarization and by the temperature dependence of $\varepsilon_{r}$. The empirical expressions of Lorentz-Lorenz, Wiener, Heller, Gladstone-Dale and Newton correlate well the $n_{D}$ data.
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