The present study is an improvement of previous work (Yousefi and Karimi, Ionics 18:135-142, 17) concern to the assessment of the ability of the Tao-Mason equation of state to predict pressure-volume-temperature (PVT) of melting polymers. The present paper, focus on the modeling of volumetric properties of polymer blends based on melting temperature (T (m)) and melting point density (rho (m)), as scaling constants. The calculation of second Virial coefficients (B (2)), effective van der Waals co-volume (b) and correction factor (alpha) are required for judgment about applicability of this model. The new correlations were used to predict the PVT behavior of polymer blends containing poly(propylene glycol) + poly(ethylene glycol) (PEG-200), poly(ethylene glycol) methyl ether(PEGME-350) + PEG-200, PEGME-350 + PEG-600, poly(2,6-dimethyl-1,4-phenylene oxide) + poly styrene(PS), and PS + poly(vinylmethylether) in different temperatures, pressures, and mole fractions. A collection of 5,397 data points has been examined for the aforementioned polymers in the temperature in the range of 298.15-605.05 K and pressures up to 200 MPa. The average absolute deviation between the calculated and experimental densities is of the order of 0.78 %.