Measurement of Activity of Water in Aqueous Poly(ethylene glycol) Solutions (Effect of Excess Volume on the Flory−Huggins χ-Parameter)
作者： Ali Eliassi , Hamid Modarress , G. Ali Mansoori
DOI: 10.1021/JE980162Z
关键词: Flory–Huggins solution theory 、 Volume (thermodynamics) 、 Maximum error 、 Analytical chemistry 、 Chemistry 、 Aqueous solution 、 PEG ratio 、 Ethylene glycol 、 Mixing (process engineering) 、 Poly ethylene glycol 、 Polymer chemistry
摘要: Activities of water are reported for aqueous solutions poly(ethylene glycol) (PEG) with number average molecular weights 300, 400, 4000, and 6000 measured at 35, 45, 55, 65 °C various concentrations from 0 to 40 wt % PEG using vapor-pressure osmometery. A cubic equation in terms is sufficient correlation activities. Using activities, the Flory−Huggins interaction parameters have been calculated. The effect temperature, weight its concentration, volume change upon mixing on parameter considered. Ignoring can lead an error 2.5% a maximum 5.3%.
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