Densities, Viscosities, and Self-Diffusion Coefficients of Several Polyethylene Glycols
Densities, Viscosities, and Self-Diffusion Coefficients of Several Polyethylene Glycols
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几种聚乙二醇的密度、粘度和自扩散系数
DOI：
10.1021/acs.jced.1c00759
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发表时间：
2022
影响因子：
--
通讯作者：
Buntkowsky, Gerd
中科院分区：
文献类型：
--
作者：
Hoffmann, Markus M.;Kealy, Joseph D.;Gutmann, Torsten;Buntkowsky, Gerd
聚乙二醇（PEG）越来越多地用作替代性绿色化学溶剂。本文介绍了在298.15 ~ 358.15 K温度范围内对PEG 200、PEG 400和几种三甘醇和六甘醇二元混合物的密度、粘度和自扩散系数进行的新的实验测量。由于PEG是多分散的，因此通过分析确定了来自六个不同供应商的PEG 200的确切组成，并发现其具有可比性。因此，仅进一步检查了最不同的PEG 200样品中的两个。水作为最常见的杂质对密度，粘度和自扩散系数的影响进行检查，以及通过外推到零水含量获得的“干”样品的结果。所得到的结果进行了仔细比较，现有的文献数据。这些物理性质的温度依赖性进行了研究，并发现是线性的密度，而粘度和自扩散系数遵循阿耳忒弥斯定律。尝试计算的二元混合物和PEG 200样品的混合物组分的物理性质的摩尔分数加权平均值的性质导致合理的协议。计算的和测量的摩尔体积之间的协议是在测量不确定度。计算的和测量的粘度的协议是大多数在几个百分点，但随着温度的降低（最大粘度）达到高达15%的值增加。同样，计算和测量的自扩散系数大多在20%以内，这接近测量不确定度，但对于最高温度（最大自扩散系数），高估增加到30%。
Polyethylene glycol (PEG) is increasingly used as an alternative green chemical solvent. New experimental measurements on density, viscosity, and self-diffusion coefficient are presented for PEG200, PEG400, and several binary mixtures of tri- and hexaethylene glycol covering a temperature range from 298.15 to 358.15 K. Because PEGs are polydisperse, the exact compositions of PEG200 from six different vendors are analytically determined and found to be comparable. Thus, only two of the most differing PEG200 samples are further examined. The effects of water as the most common impurity on densities, viscosities, and self-diffusion coefficients are inspected as well as the results of the “dry” samples obtained by extrapolation to zero water content. The obtained results are carefully compared to the available literature data. The temperature dependence of these physical properties is investigated and found to be linear for density, while viscosity and self-diffusion coefficients follow the Arrhenius law. Attempts to calculate the properties of the binary mixtures and PEG200 samples from the mole fraction weighted average of the physical properties of the mixture components result in reasonable agreement. Agreement between calculated and measured molar volumes is within measurement uncertainty. Agreement of calculated and measured viscosities is mostly within a few percent but increases with decreasing temperature (largest viscosities) reaching values of up to 15%. Similarly, calculated and measured self-diffusion coefficients mostly agree within 20%, which is near the measurement uncertainty, but overestimates increase to 30% for the highest temperatures (largest self-diffusion coefficients).
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不同温度下聚乙二醇二元混合物的热物性研究
DOI：
10.1016/j.jct.2012.11.016
发表时间：
2013
期刊：
The Journal of Chemical Thermodynamics
影响因子：
--
作者：
Mehrdad Moosavi;A. Motahari;A. Omrani;A. Rostami
通讯作者：
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影响因子：
1.2
作者：
A. Nain;Sana Ansari;A. Ali
通讯作者：
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影响因子：
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作者：
N. Zivkovic;S. Šerbanović;M. Kijevčanin;E. Živković
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结合凝固点降低和自扩散数据来表征聚集。
DOI：
10.1021/acs.jpcb.8b03456
发表时间：
2018
期刊：
The journal of physical chemistry. B
影响因子：
--
作者：
M. Hoffmann;Sarah Bothe;T. Gutmann;G. Buntkowsky
通讯作者：
G. Buntkowsky
乙腈与聚乙二醇-200的二元混合物在288.15–318.15K温度下的静态介电常数、粘度、折射率和电导率
影响因子：
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作者：
R. J. Sengwa;Priyanka Dhatarwal;S. Choudhary
通讯作者：
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