聚甲基丙烯酸丁酯—2－丁酮系统的恒温汽液平衡

Isothermal Vapor-Liquid Equilibria for Mixtures of Poly-Butyl-Methacrylate and 2-Butanone

用静态吸收－石英弹簧称重法测定了２５℃２－丁酮与３种不同分子量的单分散聚甲基丙烯酸丁酯溶液的汽液平衡。结果表明在实验误差范围内，相对蒸汽压ｐ１／ｐ对液相质量分数Ｗ１作图所得曲线与聚合物的分子量无关。Ｆｌｏｒｙ－Ｈｕｇｇｉｎｓ相互作用参数Ｘ与溶液浓度有关，聚合物分子量也有轻微影响。用修正Ｆｒｅｅｄ模型进行关联，取得了良好效果。

Using the Quartz-Spring gravimetric method,vapor-liquid equilibria for mixtures of 2-butanone and poly-butyl-methacrylate with three different molar masses from 1 7278 g·mol-1 to 88059 g·mol-1 were obtained at 25.0℃.The plots of reduced pressure p1/p01 versus mass fraction W1 were found to be independent of the molar mass of the polymer within the experimental error.The calculated Folry-Huggins interaction parameter X exhibits a strong concentration dependency.The molar mass of the polymer also exerts a definite influence. The experimental Flory-Huggins interaction parameter was correlated by the revised Freed model.