High pressure phase equilibria in the systems linear low density polyethylene+n-hexane and linear low density polyethylene+n-hexane+ethylene: Experimental results and modelling with the Sanchez-Lacombe equation of state

An approach to expediting phase equilibrium calculations for polydisperse polymers

“…The calculation method described in this paper has been used to report cloud-point curves in several papers [28][29][30][31]. Additionally, a very large number of calculations are reported in the thesis by Krenz [27].…”

“…The equation of state used in references [27][28][29][30][31] has been a modification of the Sanchez-Lacombe equation with a Helmholtz free energy function that reduces to the ideal gas expression at low pressure [27,32]. The solvent parameters in the equation have been found from pure substance critical properties and the acentric factor as advocated by Gauter and Heidemann [33] and a volume shift parameter has been introduced in order to assure that the polymer density is reproduced accurately [34].…”

Molecular mechanics and equation of state modeling of compressible polyolefin solutions: Impact of pressure and cut-off radius of intermolecular potentials

“…The pure compound parameters (Nagy et al, 2006;Krenz and Heidemann, 2007) employed in the present paper are summarized in Table 1. The EOS is obtained by differentiation of the Helmholtz energy with respect to the molar volume based on the linear and quadratic rules for the mass fraction-based model parameters as given below:…”

A Survey of Equations of State for Polymers

“…Nagy et al [93] measured cloud point, bubble point and liquid-liquid-vapor bubble point data for binary LLDPE-(n-hexane) and ternary LLDPE-(n-hexane)-ethylene systems. Experimental data were collected in the temperature range of (400 to 500) K at pressures up to 14 MPa.…”