Abstract
A method for predicting an analytical equation of state for polymer melts from surface tension and liquid state density at the freezing temperature ( γ f, ρ f), as scaling constants, is presented. B 2( T) follows a promising corresponding-states principle. Calculation of α( T) and b( T), the two other temperature-dependent constants of the equation of state, are made possible by scaling. As a result, γ f and ρ f are sufficient for the calculation of thermophysical properties of polymer melts. We applied the procedure to predict specific volumes of polyethylene glycol (PEG), polypropylene glycol (PPG), polypropylene (PP) and polyvinylchloride (PVC) at compressed state with temperature range from 298.15 to 423.15 K and pressures up to 200 MPa. The experimental specific volumes were correlated satisfactorily with our procedure and the results are within 3%.
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