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A simplified procedure with minimum input information for predicting of the densities of copolymer melts is presented. This new correlation has been applied to the Tao-Mason (TM) equation of state to predict the volumetric behavior of copolymer melts including 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), and poly(acrylonitrile-co-butadiene) (PANB). Also another model such as an artificial neural network (ANN) based on backpropagation training with 13 neurons was used. The obtained results by TM and ANN models had good agreement with the experimental data with absolute average deviations of 1.34 and 0.49 %, respectively. [ABSTRACT FROM AUTHOR]

A simplified analytical equation of with minimum input information was used to predict the volumetric properties of melting copolymers from density at the room temperature, as scaling constant. The calculation of second Virial coefficients (B2), effective van der Waals co-volume (b) and correction factor (α) are required for judgment about applicability of this model to predict of volumetric properties of melting copolymers. This new correlation has been applied to the Ihm-Song-Mason equation of state to predict the volumetric behavior of melting copolymer such as; Poly (ethylene-copropylene) (PEP), Poly (ethylene-co-vinyl acetate) (PEVA), Poly (ethyleneco-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 seven mentioned copolymers in the temperature range of 294.95 to 581.55 K and pressures to 2000 bar was used. The obtained results by modified ISM equation of state had good agreement with the experimental data with absolute average deviations of 1.16%. [ABSTRACT FROM AUTHOR]

A simplified procedure with minimum input information for calculating an analytical equation of state for copolymer melts from density and surface tension at the room temperature, as scaling constants, is presented. The second virial coefficients are calculated from a two-parameter corresponding states correlation, which is constructed with two constants as scaling parameters, i.e., the molar density ( ρ) and surface tension at room temperature ( γ). This new correlation has been applied to the Tao-Mason equation of state to calculate the volumetric behavior of copolymer melts including poly(ethylene- co-propylene), poly(ethylene- co-vinyl acetate), poly(ethylene- co-metacrylic acid), poly(ethylene- co-acrylic acid), poly(ethylene- co-vinyl alcohol), poly(styrene- co-acrylonitrile), and poly(acrylonitrile- co-butadiene). The experimental specific volumes were correlated satisfactorily with our procedure and average absolute deviation percent for 7,431 data point is within 0.93 %. [ABSTRACT FROM AUTHOR]