Abstract
The applicability of six equations of state, one of which was newly proposed by us, to n-alkane liquids was examined with respect to the corresponding states principle. Among the equations of state for hard spheres combined with the attractive energy of the van der Waals type, our new equation (the FHN equation) reproduced fairly well the observed thermodynamic relations, and the reduction parameters calculated by this equation were least dependent on temperature. The Flory equation also gave equally good results. When the equations of state for hard spheres were combined with the Lennard-Jones (m, n) potential, the Thiele equation gave better results than other equations. Furthermore, the Flory and FHN equations with the van der Waals attractive energy were compared with each other for pure polymer liquids and some small molecules except for n-alkanes. The FHN equation gave better agreement with the experimental values of the specific volume and the thermal expansivity than did the Flory equation. Also, the FHN equation was more satisfactory for the pressure dependence of polymer liquid volumes.
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Fujisawa, K., Shiomi, T., Hamada, F. et al. Van der Waals-like Equations of State. I. Application to Pure Liquids. Polym J 13, 993–1002 (1981). https://doi.org/10.1295/polymj.13.993
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DOI: https://doi.org/10.1295/polymj.13.993