有机碳酸酯与烷烃或1-烷醇混合物中的取向效应
Orientational effects in mixtures of organic carbonates with alkanes or 1-alkanols
AI总结：
本文通过摩尔过量函数、Flory模型和结构因子形式体系研究了有机碳酸酯与烷烃或1-烷醇混合物的相互作用，发现取向效应按DEC > PC > DMC递减，且取决于基团大小而非仅偶极矩。
摘要：
本文通过一系列摩尔过量函数（焓、体积、等压热容或熵），并结合内压、液液平衡或介电常数数据，研究了有机碳酸酯+烷烃以及1-烷醇+有机碳酸酯混合物的相互作用与结构。此外，还使用Flory模型和浓度-浓度结构因子形式体系对上述体系进行了研究。所研究的混合物以偶极相互作用和同配位（即同类分子间的相互作用）为特征。在给定溶剂的体系中，偶极相互作用按以下顺序减弱：碳酸丙烯酯（PC）>碳酸二甲酯（DMC）>碳酸二乙酯（DEC）。将含DMC或DEC的混合物与含2-丙酮或3-戊酮的混合物进行比较表明，偶极相互作用并非仅由偶极矩值决定，还取决于基团大小。已从量热数据评估了烷醇-碳酸酯相互作用的焓。在DMC溶液中该焓更强，且在给定碳酸酯的混合物中，随醇尺寸增大而减弱。将Flory模型应用于43个1-烷醇+碳酸酯体系，过量摩尔焓的平均相对标准偏差为0.107。结果表明，取向效应按DEC > PC > DMC的顺序递减。取向效应在甲醇或乙醇+DEC混合物中尤为显著。有趣的是，在1-烷醇+DMC混合物中，上述效应弱于DMC+烷烃体系。当所考虑的醇长于乙醇时，DEC溶液中也观察到类似趋势。
英文摘要：
Interactions and structure of organic carbonate + alkane, and 1-alkanol + organic carbonate mixtures have been investigated by means of a set of molar excess functions: enthalpies, volumes, isobaric heat capacities, or entropies; and considering internal pressure, liquid-liquid equilibria or permittivity data. In addition, the mentioned systems have been studied using the Flory model and the concentration-concentration structure factor formalism. The mixtures under consideration are characterized by dipolar interactions and by homocoordination (that is, by interactions between like molecules). In systems with a given solvent, dipolar interactions are weakened in the order: propylene carbonate (PC) > dimethyl carbonate (DMC) > diethyl carbonate (DEC). Comparison of mixtures containing DMC or DEC with those involving 2-propanone or 3-pentanone shows that dipolar interactions are not determined merely by values of the dipole moment, but they also depend on the group size. The enthalpies of the alkanol-carbonate interactions have been evaluated from calorimetric data. They are stronger in DMC solutions and become weaker when the alcohol size increases in mixtures with a given carbonate. Application of the Flory model to 43 systems of the type 1-alkanol + carbonate provides a mean relative standard deviation for excess molar enthalpy equal to 0.107. Results reveal that orientational effects decrease in the order DEC > PC > DMC. Orientational effects are particularly relevant in methanol or ethanol + DEC mixtures. Interestingly, the mentioned effects are weaker in 1-alkanol + DMC mixtures than in DMC + alkane systems. A similar trend is observed in DEC solutions when the considered alcohol is longer than ethanol.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
