Abstract
PVT properties were measured for fractionation cuts of poly(ethylene glycol methyl ether)-350, poly(ethylene glycol)-200, poly(ethylene glycol)-600, and their blends at temperatures from 298 K to 338 K and pressures up to 30 MPa. Excess volumes were found to be negative in blending poly(ethylene glycol)s with poly(ethylene glycol methyl ether). The pressure effect on the liquid densities was represented accurately by the Tait equation, which was used to calculate isothermal compressibilities for the oligomers and the oligomeric blends. Both the Flory−Orwoll−Vrij and the Schotte equations of state were employed to correlate the experimental specific volumes. Accurate results were obtained from these two equations.
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