聚苯乙烯－乙酸正丁酯系统的恒温汽液平衡

Vapor-Liquid Equilibria for Mixtures of Polystyrene and n-Butyl Acetate

用静态吸收，石英弹簧称重法，测定了２９８．１５Ｋ时乙酸正丁酯与三种不同摩尔质量的单分散聚苯乙烯系统的汽液平衡。结果表明，在实验误差范围内，以相对蒸汽压对液相质量分数ｗ＿１作图，所得汽液平衡曲线与聚合物的摩尔质量无关。Ｆｌｏｒｙ－Ｈｕｇｇｉｎｓ相互作用参数χ主要依赖于溶液浓度，聚合物摩尔质量也有轻微影响。用修正的Ｆｒｅｅｄ模里关联实验数据，取得了满意的结果。

Using the quartz-spring gravimetric method ,vapor-liquid equilibria for mix-tures of n-butyl acetate and polystyrene with three different molar masses form 37 900g·mol￣(-1)to 3 840 000 g·mol￣(-1)were obtained at 25.0℃. The reduced pressure p1/p1°versusmass fraction w_1 plots are found to be independent of the molar mass of the polymer withinthe experimental error.Calculated Flory-Huggins interaction parameters X exhibit a strongconcentration dependence. The molar mass of the polymer also exerts a definite influence.The experimental Flory-Huggins interaction parameters were correlated by the revised Freed model.