MIXING ENTHALPY AND PHASE-SEPARATION IN A POLY(PROPYLENE OXIDE)-WATER SYSTEM

被引：19

作者：

CARLSSON, M ^{[1
]}

HALLEN, D ^{[1
]}

LINSE, P ^{[1
]}

机构：

[1] LUND UNIV,CTR CHEM,S-22100 LUND,SWEDEN

来源：

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1995年 / 91卷 / 14期

关键词：

D O I：

10.1039/ft9959102081

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Calorimetric measurements of the differential enthalpies of mixing a propylene oxide oligomer and water at two temperatures have been performed and the integral mixing enthalpies were found to be exothermic. The measurements were compared with the predictions of an extended Flory-Huggins model and a semiquantitative agreement was found. The model suggests that the origin of the exothermic mixing is a conformational change of the propylene oxide oligomer from less polar and higher-energy conformers to more polar and lower-energy conformers upon mixing with water.

引用

页码：2081 / 2085

页数：5

共 27 条

[1] POLY(ETHYLENE OXIDE)-POLY(PROPYLENE OXIDE)-POLY(ETHYLENE OXIDE) BLOCK-COPOLYMER SURFACTANTS IN AQUEOUS-SOLUTIONS AND AT INTERFACES - THERMODYNAMICS, STRUCTURE, DYNAMICS, AND MODELING [J].