THE THERMODYNAMIC PROPERTIES OF AQUEOUS SOLUTIONS OF POLYETHYLENE GLYCOL, POLYPROPYLENE GLYCOL AND DIOXANE
THE THERMODYNAMIC PROPERTIES OF AQUEOUS SOLUTIONS OF POLYETHYLENE GLYCOL, POLYPROPYLENE GLYCOL AND DIOXANE
复制标题
DOI：
10.1039/tf9575300921
复制
发表时间：
1957-01-01
影响因子：
--
通讯作者：
ROWLINSON, JS
中科院分区：
文献类型：
--
作者：
MALCOLM, GN;ROWLINSON, JS
测量了聚乙二醇和聚丙二醇在水中的溶液的蒸气压、混合热、密度和相关系。导出了自由能、稀释热、稀释熵、混合时的体积变化和超额分体积。结果表明，与其他极性聚合物溶液的显着差异。与聚乙二醇中重复单元的环状二聚体二氧六环的水溶液的结果进行了比较。本文在附录中报道了二氧六环+水溶液在100 ~ 156 ℃的蒸气压和25 ℃的混合热的一些新的测量结果。对于含有极性分子的聚合物溶液的热力学性质，迄今还没有精确的测量结果。本文报道了聚乙二醇和聚丙二醇水溶液性质的详细研究结果。这些溶液提供了聚合物溶液的实例，其中可能发生溶剂分子的缔合和聚集，并且其中溶剂和聚合物之间存在取向依赖性相互作用。选择聚乙二醇和聚丙二醇是因为它们是最简单的可用聚醚。其他几种聚醚正在为今后的研究做准备。
Measurements are reported of the vapour pressures, the heats of mixing, the densities and the phase relationships of solutions of polyethylene glycol and polypropylene glycol in water. The free energies, heats and entropies of dilution, the volume changes on mixing and the excess partial volumes have been derived. The results show significant differences from those for other polar polymer solutions. A comparison is made with the results for aqueous solutions of dioxane which is the cyclic dimer of the repeating unit in polyethylene glycol. Some new measurements of the vapour pressures of dioxane+ water solutions at temperatures between 100" C and 156" C and of the heat of mixing at 25" C, are reported in an appendix.Few precise measurements have yet been made of the thermodynamic properties of polymer solutions which contain polar molecules. This paper reports the results of a detailed investigation of the properties of the solutions of polyethylene glycol and polypropylene glycol in water. These solutions provide examples of polymer solutions in which association and clustering of solvent molecules may occur and in which orientation-dependent interactions are present between solvent and polymer. Polyethylene glycol and polypropylene glycol were chosen because they are the simplest available polyethers. Several other polyethers are in course of preparation for future study.