M. Carlsson et al., MIXING ENTHALPY AND PHASE-SEPARATION IN A POLY(PROPYLENE OXIDE)-WATERSYSTEM, Journal of the Chemical Society. Faraday transactions, 91(14), 1995, pp. 2081-2085
Citations number
27
Categorie Soggetti
Chemistry Physical","Physics, Atomic, Molecular & Chemical
Calorimetric measurements of the differential enthalpies of mixing a p
ropylene oxide oligomer and water at two temperatures have been perfor
med and the integral mixing enthalpies were found to be exothermic. Th
e measurements were compared with the predictions of an extended Flory
-Huggins model and a semiquantitative agreement was found. The model s
uggests that the origin of the exothermic mixing is a conformational c
hange of the propylene oxide oligomer from less polar and higher-energ
y conformers to more polar and lower-energy conformers upon mixing wit
h water.