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鉴于活度系数与内压密切相关 ,修正了熟知的vanLaar理论 ,用Frank关系式替代了原理论推导中的vanderWaals流体内压 ,从而导得一个十分类似于Wohl方程的过量函数式 ,vanLaar方程、溶解度参数方程、Margules方程和Scatchard -Hamer方程等都是它的特例 .通过对过量熵贡献的修正 ,建立了一个活度系数方程 .它已被证明具有通用性 ,即不仅适用于各种小分子液体混合物 ,而且亦适用于各种高分子溶液 ,有比局部组成型方程更广的适用范围 .此外 ,由该Gibbs自由能模型还得到了溶解度参数一个新的定义 ,它比Hildebrand定义的溶解度参数更加广义 .
Since the activity coefficient is closely related to the internal pressure, the well-known van Laar theory was modified and Frank’s relation was substituted for the van der Waals fluid pressure in the original theoretical derivation, leading to an excess function, van Laar equation very similar to the Wohl equation, The solubility parameter equation, the Margules’ equation and the Scatchard-Hamer equation are all special cases of this. By modifying the contribution of excess entropy, an activity coefficient equation has been established that has been shown to be versatile, ie not only applicable to various small molecules Liquid mixture, but also for a variety of polymer solutions, has a wider range of application than the local compositional equation.In addition, the Gibbs free energy model also obtained a new definition of solubility parameters, which is more than the solubility parameters defined by Hildebrand More general.