REPRESENTATION OF VAPOR LIQUID AND LIQUID LIQUID EQUILIBRIA FOR BINARY-SYSTEMS CONTAINING POLYMERS - APPLICABILITY OF AN EXTENDED FLORY HUGGINS EQUATION
REPRESENTATION OF VAPOR LIQUID AND LIQUID LIQUID EQUILIBRIA FOR BINARY-SYSTEMS CONTAINING POLYMERS - APPLICABILITY OF AN EXTENDED FLORY HUGGINS EQUATION
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DOI：
10.1002/app.1993.070470707
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发表时间：
1993-02-15
影响因子：
3
通讯作者：
PRAUSNITZ, JM
中科院分区：
文献类型：
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作者：
BAE, YC;SHIM, JJ;PRAUSNITZ, JM
对于某些二元体系，推广的Flory-Huggins方程在使用相同的可调参数时既适用于汽液平衡（VLE），也适用于液液平衡（LLE）。报道了聚苯乙烯（PS）（MW = 100，00）/环己烷和聚（乙二醇）（PEG）（MW = 8，000）/水的新的液液平衡和汽平衡数据。PS/环己烷体系的实验结果与半经验模型吻合得很好，而PEG/水体系的实验结果则不符合，这可能是因为，对于PEG/水体系，汽液平衡数据的温度范围比液液平衡数据的温度范围低约55 ℃。对于我们先前发表的PS/环己烷（上临界溶解温度，UCST）、PS/乙酸乙酯（下临界溶解温度，LCST）、PS/乙酸叔丁酯和PS/乙酸甲酯（UCST和LCST两者）以及PEG/水（闭环）的实验结果，获得了极好的拟合。半经验模型也适合与新的数据获得的聚合物共混物PS/聚（乙烯基甲基醚）。
For some binary systems, an extended Flory-Huggins equation is applicable to both vapor-liquid equilibria (VLE) and liquid-liquid equilibria (LLE) using the same adjustable parameters. New LLE and VLE data are reported for polystyrene (PS) (MW = 100,00)/cyclohexane and for poly(ethylene glycol) (PEG) (MW = 8,000)/water. Experimental results for the PS/cyclohexane system agree well with the semiempirical model, whereas those for PEG/water do not, probably because, for PEG/water, the temperature range of the VLE data is about 55-degrees-C lower than that of the LLE data. Excellent fits were obtained for our previously published experimental results for PS/cyclohexane (upper critical solution temperature, UCST), PS/ethyl acetate (lower critical solution temperature, LCST), PS/tert-butylacetate and PS/methyl acetate (both UCST and LCST), and PEG/water (closed-loop). The semiempirical model also fits well with new data obtained for the polymer blend PS/poly(vinyl methyl ether).