An Analytical Equation of State Extended to Copolymers

calculate some thermodynamic properties of molten polymers including specific volume and isothermal compressibility (S.M. Hoseini, Physical Chemistry & Electrochemistry, ۲ (۲۰۱۴) ۵۶-۶۵). This work extended that EOS to predict the volumetric properties of some molten ethylene copolymers including ethylene/۱-octene, ethylene/۱-butene (xethylene equal to ۰.۸۵۴۳ and ۰.۵۶۳), ethylene/propene. The ability of the extended EOS was checked by comparing the results with ۷۳۸ literature data points for the specific volumes over the temperature range from ۴۲۲.۳۵-۵۰۵.۸۹ K and pressure range from ۰.۱ up to ۲۰۰ MPa. The average absolute deviation (AAD) of the calculated specific volumes from literature data was found to be ۱.۱۲%. The isothermal compressibility coefficients, κT have also been predicted using ISM EOS. From ۱۸۰ data points examined, the AAD of estimated κT was equal to ۸.۴۸%. Our calculations on the volumetric and thermodynamic properties of studied copolymers reproduced the literature data with reasonably good accuracy. Equation of state, Copolymer melts, Thermodynamic properties