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对三种不同相对分子质量的聚甲基丙烯酸甲酯（ＰＭＭＡ）单分散样品，用石英弹簧重量法测定了３５°Ｃ下２－丁酮－ＰＭＭＡ、氯仿－ＰＭＭＡ两系统的汽液平衡数据。分析了Ｆｌｏｒｙ－Ｈｕｇｇｉｎｓ相互作用参数χ与溶液组成及样品的相对分子质量的关系。用ＵＮＩＦＡＣ－ＦＶ模型预测了溶剂的活度系数，并与实验结果进行了比较。
The vapor-liquid equilibrium data of two systems of 2-butanone-PMMA and chloroform-PMMA at 35 ° C were measured by quartz spring gravimetric method for three monodispersed samples of PMMA with different relative molecular mass. The relationship between the Flory-Huggins interaction parameter χ and the solution composition and the relative molecular mass of the sample was analyzed. The UNIFAC-FV model was used to predict the activity coefficient of the solvent, and compared with the experimental results.