Density, apparent viscosity, electrical conductivity, interfacial tension, and intermolecular interactions of PEG-ZnCl2-EG solution

IF 5.3 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Liquids Pub Date : 2025-05-08 DOI:10.1016/j.molliq.2025.127634

Xunwei Liu, Kun Liu, Chang Yao, Dedan Deng, Chang Tian

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引用次数: 0

Abstract

In order to understand the high solubility of polymers in deep eutectic solvent from the perspective of intermolecular interactions, herein we report the thermodynamic and transport properties of a polymer-deep eutectic solvent (DES) solution. The density, apparent viscosity, electrical conductivity, and interfacial tension for the mixtures of poly (ethylene glycol) (PEG)/with various zinc chloride (ZnCl₂)/ethylene glycol (EG) compositions were determined experimentally in the temperature range of 303.15–343.15 K. The variations of density, apparent viscosity, electrical conductivity, and interfacial tension with the temperature, PEG concentration, molar ratio of ZnCl₂ to EG, and PEG molecular weight were analyzed and interpreted with the variations of H-bond, molecular thermal motion, polymer chain-ends effect, and polymer chain entanglement. The results showed that the hydrogen bond effect displayed enhancement with molar ratio of ZnCl₂/EG and weakening with temperature, PEG concentration and molecular weight. The polymer chain-ends effect on density, apparent viscosity, electrical conductivity, and interfacial tension was enhanced with PEG concentration and weakened with PEG molecular weight. The effect of polymer chain entanglement was enhanced with PEG concentration and molecular weight. At low temperatures the Zn²⁺-EG H-bond was stronger than Zn²⁺-PEG while the situation became opposite at high temperatures. The correlations of density, apparent viscosity, and electrical conductivity with temperature and correlation of viscosity with density were conducted.

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PEG-ZnCl2-EG溶液的密度、表观粘度、电导率、界面张力和分子间相互作用

为了从分子间相互作用的角度理解聚合物在深共晶溶剂中的高溶解度，本文报道了聚合物-深共晶溶剂（DES）溶液的热力学和输运性质。在303.15 ~ 343.15 K的温度范围内，测定了聚乙二醇(PEG)/各种氯化锌(ZnCl2)/乙二醇（EG）混合物的密度、表观粘度、电导率和界面张力。通过氢键、分子热运动、聚合物链端效应和聚合物链缠结的变化分析和解释了密度、表观粘度、电导率和界面张力随温度、PEG浓度、ZnCl2与EG的摩尔比和PEG分子量的变化。结果表明：氢键效应随ZnCl2/EG摩尔比的增加而增强，随温度、PEG浓度和分子量的增加而减弱；聚合物链端对密度、表观粘度、电导率和界面张力的影响随PEG浓度的增加而增强，随PEG分子量的增加而减弱。聚乙二醇的浓度和分子量对聚合物链缠结的影响增强。在低温下，Zn2+-EG的氢键比Zn2+-PEG的氢键强，而在高温下则相反。研究了密度、表观粘度、电导率与温度的关系以及粘度与密度的关系。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Molecular Liquids 化学-物理：原子、分子和化学物理

CiteScore

10.30

自引率

16.70%

发文量

2597

审稿时长

78 days

期刊介绍： The journal includes papers in the following areas: – Simple organic liquids and mixtures – Ionic liquids – Surfactant solutions (including micelles and vesicles) and liquid interfaces – Colloidal solutions and nanoparticles – Thermotropic and lyotropic liquid crystals – Ferrofluids – Water, aqueous solutions and other hydrogen-bonded liquids – Lubricants, polymer solutions and melts – Molten metals and salts – Phase transitions and critical phenomena in liquids and confined fluids – Self assembly in complex liquids.– Biomolecules in solution The emphasis is on the molecular (or microscopic) understanding of particular liquids or liquid systems, especially concerning structure, dynamics and intermolecular forces. The experimental techniques used may include: – Conventional spectroscopy (mid-IR and far-IR, Raman, NMR, etc.) – Non-linear optics and time resolved spectroscopy (psec, fsec, asec, ISRS, etc.) – Light scattering (Rayleigh, Brillouin, PCS, etc.) – Dielectric relaxation – X-ray and neutron scattering and diffraction. Experimental studies, computer simulations (MD or MC) and analytical theory will be considered for publication; papers just reporting experimental results that do not contribute to the understanding of the fundamentals of molecular and ionic liquids will not be accepted. Only papers of a non-routine nature and advancing the field will be considered for publication.