聚乙二醇在2-正丁氧基乙醇/水混合溶剂中的溶剂化行为  

Solvation Behaviors of Polyethylene Glycol in Mixed Solvents of 2-Butoxyethanol/Water

作　　者：柏宇霄 于思涵 陈志云[1] BAI Yuxiao;YU Sihan;CHEN Zhiyun(School of Chemistry and Molecular Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学化学与分子工程学院,上海200237

出　　处：《华东理工大学学报（自然科学版）》2023年第1期26-33,共8页Journal of East China University of Science and Technology

基　　金：国家自然科学基金(21403067,21773063)。

摘　　要：采用动态光散射(DLS)、共振光散射(RLS)、密度和比热容方法,研究了聚乙二醇(PEG)/2-正丁氧基乙醇(2BE)/水溶液的性质。粒径分布和共振光散射强度测试结果表明2BE摩尔分数会影响溶液中PEG分子、水分子和2BE分子的聚集结构和相互作用,PEG分子加入会破坏并重组2BE/H2O缔合物聚集体和2BE自缔合体,并使2BE/H2O缔合物聚集体和2BE自缔合体尺寸增大。Polyethylene glycol(PEG), a low toxicity and stable water-soluble polymer compound, is widely used as the auxiliary material, solvent, additive and modifier. Its behavior in aqueous solution has been studied through spectroscopy, chromatograph, molecular simulation and many other experiments, but the study of structures and interactions in PEG/alcohol/water solution is scarce, which has important sigficance for the application of PEG. In this paper, the properties of a series of PEG/2-butoxyethanol(2BE)/water solutions were studied by measuring dynamic light scattering, resonance light scattering, density and heat capacity. The particle size distribution and resonance light scattering intensity of 2BE/H2O and PEG/2BE/H2O solutions determined by light scattering experiments showed that2BE content affected the aggregation structures and interactions in solutions, and the addition of PEG molecules destroied and recombined the 2BE/H2O association aggregates and the 2BE self-association aggregates, which increased the sizes of the aggregates. The apparent molar volume of infinite dilution(V~0Φ,PEG), the interaction parameter(SV) and the apparent molar heat capacity(CΦ,PEG) for PEG chain in 2BE/H2O mixed solvents were deduced from the data of density and heat capacity at 25 ℃. V~0Φ,PEGreached the minimum value at x2BE=0.024 2;SVincreased first, then decreased and finally increased again with the increase of x2BE, and changed from the negative to the positive at x2BE=0.016 7,and had a positive maximum at x2BE=0.024 2;CΦ,PEGdecreased with the increase of x2BE, but the decrease became not obvious when x2BE>0.016 7. The above characteristic changes of macroscopic thermodynamic variables were consistent with the structures and interactions in the solutions.

关 键 词：聚乙二醇 2-正丁氧基乙醇 密度 溶剂化行为 

分 类 号：O64[理学—物理化学]