Article
Thermophysical Properties of Materials
2000. V. 38. № 5. P. 690–697
Nikitin E.D., Pavlov P.A.
Van der Waals chain-molecule fluid in self-consistent field approximation: Some thermal properties
Annotation
The van der Waals equation for a monomer is used to derive the equation of state for a fluid consisting of chain molecules of equal length. The evolution of a part of the diagram of state pertaining to liquid-vapor equilibrium is treated for the case of an increase in the number of links in a molecule. The dependences on the number of links n are found for the following properties of polymer fluid: the critical temperature Tc, the critical pressure pc, the critical density ρc, the critical compressibility zc, the temperature of normal boiling, the Riedel parameter of similarity α, the acentric factor ω, and the enthalpy of vapor formation ΔHν. A comparison with the experimental data for n-alkanes and 1-alkanols reveals that the obtained dependences reflect qualitatively correctly the variation of the above-identified properties with an increase of the number of links in a molecule. For long chains (n≫1), the scaling dependences are determined for the properties of a chain-molecule fluid: Tc∼1−n−1/2, pc∼n−3/2, ρc∼n−1/2, zc∼n−1, α∼n, ω∼n2/3, ΔHν∼n.
Article reference:
Nikitin E.D., Pavlov P.A. Van der Waals chain-molecule fluid in self-consistent field approximation: Some thermal properties, High Temp., 2000. V. 38. № 5. P. 690
Nikitin E.D., Pavlov P.A. Van der Waals chain-molecule fluid in self-consistent field approximation: Some thermal properties, High Temp., 2000. V. 38. № 5. P. 690