The Fluid‐Lattice Theory (Ising Fluid), recently tested by Lacombe and Sanchez, has been modified by introducing the typical Flory's surface‐to‐volume ratio of the characteristic‐segment of a polymeric liquid. This surface‐to‐volume ratio is not an adjustable parameter. It is obtained from Bondi's tabulations. The resulting new equation of state has three adjustable parameters per component and it represents a definite improvement for the fitting of P‐V‐T data for polymeric liquids. Extension to mixtures is not tested in this work but, in principle, it can be done by well‐established methods.
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Panayiotou et al. (1982) studied this question.
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