An Analytical Equation of State for Molten Polymers

An analytical equation of state (EOS) developed by Ihm-Song-Mason (ISM) has been applied tocalculate some thermophysical properties of molten polymers including Poly (۱-octene) (PO), Poly (vinylmethyl ether) (PVME), Poly (vinyl chloride) (PVC), and Poly (styrene) (PS). Three temperature-dependentparameters of the ISM EOS have been determined based on the alternative scaling constants, dispersiveenergy parameters between segments/monomers (ε) and segment diameter (σ). The ability of the proposedEOS has been checked by comparing the results with ۵۴۷ literature data points for the specific volumes overtemperature from ۳۱۱-۵۵۷ K and pressure ranging from ۰.۱ up to ۲۰۰ MPa. The average absolute deviation(AAD) of the calculated specific volumes from literature data was found to be ۰.۴۷%. The isothermalcompressibility coefficients, κT have also been predicted using ISM EOS. From ۱۸۸ data points examined,the AAD of estimated κT was equal to ۷.۷۵%. Our calculations on the volumetric and thermodynamicproperties of studied polymers reproduce the literature data with reasonably good accuracy.

کلیدواژه ها:

Equation of state ، Molten Polymers ، thermodynamic properties