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, 2 (2014) 56-65). this work extended that eos to predict the volumetric properties of some molten ethylene copolymers including ethylene/1-octene, ethylene/1-butene (xethylene equal to 0.8543 and 0.563), ethylene/propene. the ability of the extended eos was checked by comparing the results with 738 literature data points for the specific volumes over the temperature range from 422.35-505.89 k and pressure range from 0.1 up to 200 mpa. the average absolute deviation (aad) of the calculated specific volumes from literature data was found to be 1.12%. the isothermal compressibility coefficients, κt have also been predicted using ism eos. from 180 data points examined, the aad of estimated κt was equal to 8.48%. 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