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实际链状流体混合物的亥氏函数表示为参考流体（硬球链流体混合物）的贡献和由于链节间的方阱位能相互作用的贡献之和．前者直接用作者先前建立的硬球链流体混合物的分子热力学模型计算，不含混合规则；后者采用Alder等人的结果，用vanderWaals单流体理论计算混合物的能量参数.对于不含氢键作用的二元混合物，有一可调相互作用参数，需由实验数据拟合得到．本模型可以满意地关联小分子混合物和高分子溶液的汽液平衡。
The Herren function of the actual chain fluid mixture is expressed as the sum of the contribution of the reference fluid (hard-chain fluid mixture) and the contribution due to the interaction of the square-well positions between the chains. The former is calculated directly by the molecular thermodynamic model of the hard-chain fluid mixture previously established by the authors without the mixing rule; the latter uses the results of Alder et al. To calculate the energy parameters of the mixture using van der Waals fluid theory. For hydrogen Yuan mixture, there is an adjustable interaction parameters, to be obtained from the experimental data fitting. The model satisfactorily correlates the vapor-liquid equilibrium of small molecule mixtures and polymer solutions.