Phase Equilibria of PEG/Sulfate Salt Aqueous Two-Phase Systems: Effects of pH and Molecular Weight of Polymer

IF 1.4 Q3 CHEMISTRY, MULTIDISCIPLINARY Physical Chemistry Research Pub Date : 2021-09-01 DOI:10.22036/PCR.2021.260208.1862

M. Pirdashti, Z. Heidari, Seyyed Mohammad Arzideh, I. Khoiroh, Shakiba Shabani, Nahid Abbasi Fashami

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引用次数: 1

Abstract

In this study, the liquid-liquid equilibrium (LLE) in the aqueous two-phase system (ATPS) formed by polyethylene glycol (PEG1500 and PEG6000) and magnesium sulfate is investigated. The experimental measurements were performed at temperature of 298.15 K and pH values of 3.60, 5.00, 6.67. Densities and refractive indices of the mixtures were first measured to obtain the compositions from the plotted tie lines. The effects of pH and molecular mass of polymers on the binodal curve, tie lines length (TLL) and slope of tie line (STL) have been examined. It was found the pH values and molecular weight rise the heterogeneous region for each system. The binodal curve was fitted to the Merchuk and the Pirdashti equations. The Othmer-Tobias as well as the Bancroft equations were subsequently selected to correlate the compositions of the tie lines at equilibrium where the fitted parameters are derived. In addition, the Guan’s equation was utilized to correlate the experimental binodal curves. Finally, the effectively excluded volume (EEV) was determined and the values were found to increase with pH.

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聚乙二醇/硫酸盐水两相体系的相平衡:pH和聚合物分子量的影响

本文研究了聚乙二醇(PEG1500和PEG6000)与硫酸镁形成的水两相体系(ATPS)的液液平衡(LLE)。实验测量温度为298.15 K, pH值为3.60、5.00、6.67。首先测量了混合物的密度和折射率，以从绘制的连线中获得成分。考察了pH值和聚合物分子质量对双节曲线、结线长度和结线斜率的影响。结果表明，各体系的pH值和分子量均呈上升趋势。双节曲线拟合了Merchuk和Pirdashti方程。随后选择other - tobias以及Bancroft方程来关联平衡状态下的系线组成，其中拟合参数推导。此外，还利用关氏方程对实验双节曲线进行了关联。最后，测定了有效排除体积(EEV)，发现其值随pH值的增加而增加。

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来源期刊

Physical Chemistry Research CHEMISTRY, MULTIDISCIPLINARY-

CiteScore

2.70

自引率

8.30%

发文量

期刊介绍： The motivation for this new journal is the tremendous increasing of useful articles in the field of Physical Chemistry and the related subjects in recent years, and the need of communication between Physical Chemists, Physicists and Biophysicists. We attempt to establish this fruitful communication and quick publication. High quality original papers in English dealing with experimental, theoretical and applied research related to physics and chemistry are welcomed. This journal accepts your report for publication as a regular article, review, and Letter. Review articles discussing specific areas of physical chemistry of current chemical or physical importance are also published. Subjects of Interest: Thermodynamics, Statistical Mechanics, Statistical Thermodynamics, Molecular Spectroscopy, Quantum Chemistry, Computational Chemistry, Physical Chemistry of Life Sciences, Surface Chemistry, Catalysis, Physical Chemistry of Electrochemistry, Kinetics, Nanochemistry and Nanophysics, Liquid Crystals, Ionic Liquid, Photochemistry, Experimental article of Physical chemistry. Mathematical Chemistry.