Measurement of activity of water in aqueous poly(ethylene glycol) solutions (Effect of excess volume on the Flory-Huggins χ-parameter)
Measurement of activity of water in aqueous poly(ethylene glycol) solutions (Effect of excess volume on the Flory-Huggins χ-parameter)
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DOI：
10.1021/je980162z
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发表时间：
1999-01-01
期刊：
影响因子：
--
通讯作者：
Mansoori, GA
中科院分区：
文献类型：
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作者：
Eliassi, A;Modarress, H;Mansoori, GA
报道了数均分子量为300、400、4000和6000的聚（乙二醇）（PEG）水溶液的水活度，在35、45、55和65 ℃下和在0至40重量%PEG的各种浓度下使用蒸气压渗透计测量。PEG浓度的三次方程足以用于活性的相关性。利用测得的活度，计算了Flory-Huggins相互作用参数。考虑了温度、PEG分子量及其浓度、混合时体积变化对相互作用参数的影响。忽略混合的体积变化会导致平均误差为2.5%，最大误差为5.3%。
Activities of water are reported for aqueous solutions of poly(ethylene glycol) (PEG) with number average molecular weights of 300, 400, 4000, and 6000 are measured at 35, 45, 55, and 65 degrees C and at various concentrations from 0 to 40 wt % of PEG using vapor-pressure osmometery. A cubic equation in terms of PEG concentrations is sufficient for correlation of activities. Using measured activities, the Flory-Huggins interaction parameters have been calculated. The effect of temperature, molecular weight of PEG and its concentration, and volume change upon mixing on interaction parameter have been considered. Ignoring the volume change of mixing can lead to an average error of 2.5% with a maximum error of 5.3%.