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以Ｆｌｏｒｙ－Ｈｕｇｇｉｎｓ理论为基础，对ＰＥＳ－ＰＧ－ＮＭＰ－Ｈ２Ｏ（聚醚砜－丙二醇－Ｎ－甲基－２－吡咯烷酮－水）四元制膜液体系的相图进行了计算．利用三元相图考察Ｈ２Ｏ和ＰＧ对液－液相分离的影响．在三元理论的基础上提出了低分子量添加剂的四元改性Ｆｌｏｒｙ－Ｈｕｇｇｉｎｓ理论，并提出了一种获得四元相图的方法．利用四元相图能较好地描述四元体系，利用改性的四元理论，能更好地解释该种体系的液－液相分离行为
Based on the Flory-Huggins theory, the phase diagram of the quaternary membrane system of PES-PG-NMP-H2O (polyethersulfone-propanediol-N-methyl-2-pyrrolidone-water) was calculated. Investigation of the Effect of H2O and PG on the Liquid - Liquid Separation by Using Ternary Phase Diagram. Based on the ternary theory, a quaternary modified Flory-Huggins theory of low molecular weight additives was proposed and a method of obtaining quaternary phases was proposed. The quaternary phase diagram can be used to describe the quaternary system well, and the modified quaternion theory can better explain the liquid-liquid phase separation behavior of the system