An Analytical Equation of State for Molten Polymers

Document Type : Research Paper


Young Researchers and Elite Club, Marvdasht Branch, Islamic Azad University,Marvdasht, Iran


An analytical equation of state (EOS) developed by Ihm-Song-Mason (ISM) has been applied to
calculate some thermophysical properties of molten polymers including Poly (1-octene) (PO), Poly (vinyl
methyl ether) (PVME), Poly (vinyl chloride) (PVC), and Poly (styrene) (PS). Three temperature-dependent
parameters of the ISM EOS have been determined based on the alternative scaling constants, dispersive
energy parameters between segments/monomers (ε) and segment diameter (σ). The ability of the proposed
EOS has been checked by comparing the results with 547 literature data points for the specific volumes over
temperature from 311-557 K and pressure ranging from 0.1 up to 200 MPa. The average absolute deviation
(AAD) of the calculated specific volumes from literature data was found to be 0.47%. The isothermal
compressibility coefficients, κT have also been predicted using ISM EOS. From 188 data points examined,
the AAD of estimated κT was equal to 7.75%. Our calculations on the volumetric and thermodynamic
properties of studied polymers reproduce the literature data with reasonably good accuracy.


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