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Application of the Ihm-Song-Mason equation of state and its extension to copolymers using minimum input parameter
Zeynab Amoozandeh and Fakhri Yousefi

This paper reports a method for predicting the participating constants in equation of state (EOS) for compressed copolymer fluids using minimum information. The theoretical EOS assumed is Ihm–Song–Mason (ISM), and the minimum information is the molar density at room temperature. This new correlation has been applied to the Ihm-Song-Mason equation of state (ISM EOS) to predict the volumetric properties of copolymer melts such as: Poly (ethylene-co-propylene) (PEP), Poly (ethylene-co-vinyl acetate) (PEVA), Poly (ethylene-co-metacrylic acid) (PEMA), Poly(ethylene-co-acrylic acid) (PEAA), Poly (ethylene-co-vinyl alcohol) (PEVOH), Poly (styrene-co-acrylonitrile) (PSAN), Poly (acrylonitrile-co-butadiene) (PANB). A collection of 7693 data points for above-mentioned copolymers in the temperature range of 294.95 to 581.55 K and pressures to 2000 bar was used. The attained outcomes by modified ISM equation of state had good agreement with the experimental data with absolute average deviations of 1.29%.

Keywords: Copolymer melt; Volumetric properties; Equation of state; Second virial coefficient, Minimum information

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