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Equation of state for polymers based on glass transition data
Authors:Mohammad Mehdi Papari  Reza Behjatmanesh-Ardakani  Masoumeh Kiani  Jalil Moghadasi  Antonio Campo
Affiliation:(1) Department of Chemistry, Shiraz University of Technology, Shiraz, 71555-313, Iran;(2) Department of Chemistry, Payame Noor University (PNU), Ardakan, Iran;(3) Department of Chemistry, Shiraz University, Shiraz, 71454, Iran;(4) Department of Mechanical Engineering, The University of Texas at San Antonio, San Antonio, TX 78249, USA
Abstract:This paper addresses a method for predicting the participating constants in equation of state (EOS) for compressed polymeric fluids using two scaling constants, the surface tension γ g and the molar density ρ g, both at the glass transition point. The theoretical EOS undertaken is the one attributed to Tao and Mason. 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 surface tension γ g and the molar density ρ g. This new correlation has been applied to the Tao–Mason (TM) EOS to predict the volumetric behavior of several polymer melts. The operating temperature range is from 291.25 to 603.4 K and pressures of up to 202.5 MPa. A collection of 516 data points has been examined for the aforementioned polymers. The average absolute deviation between the calculated densities and the experimental ones is of the order of 0.44%.
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