Pressure-volume-temperature and excess molar volume prediction of amorphous and crystallizable polymer blends by equation of state

In this work the statistical mechanical equation of state was developed for volumetric properties of crystalline and amorphous polymer blends. The Ihm–Song–Mason equations of state (ISMEOS) based on temperature and density at melting point (Tm and ρm) as scaling constants were developed for crystalline polymers such as poly(propylene glycol) + poly(ethylene glycol)-200 (PPG + PEG-200), poly(ethylene glycol) methyl ether-300 (PEGME-350) + PEG-200 and PEGME-350 + PEG-600. Furthermore, for amorphous polymer blends containing poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) + polystyrene (PS) and PS + poly(vinylmethylether) (PVME), the density and surface tension at glass transition (ρg and γg) were used for estimation of second Virial coefficient. The calculation of second Virial coefficients (B2), effective van der Waals co-volume (b) and correction factor (α) was required for judgment about applicability of this model. The obtained results by ISMEOS for crystalline and amorphous polymer blends were in good agreement with the experimental data with absolute average deviations of 0.84% and 1.04%, respectively.