ガスクロ法によるポリエチレングリコールー有機化合物系の熱力学的性質の測定

概要

論文の詳細を見る
A gas-liquid chromatographic technique was employed to study the thermodynamic properties of systems of polyethylene glycol (PEG) and organic compounds. Three kinds of PEG different in molecular weight were used as a fixed phase, and the specific retention volumes of methanol and benzene were measured in the range of 30 to 80℃. While the retention volume of benzene scarcely varied with a sample size, that of methanol increased as a sample size became smaller. From the specific retention volumes at an infinitesimal sample size, thermodynamic properties at the infinite dilution such as an activity coefficient based on molality, a Henry's coefficient based on molality, and a partial molar excess enthalpy, were calculated. In the case of methanol, as a molecular weight of PEG decreased, a partial molar excess enthalpy decreased, and a Henry's coefficient increased. Those of benzene, however, did not varied with a molecular weight of PEG. From the value and behaviour of these thermodynamic properties, the effects of the end OH group were discussed.