PVT properties of polyethylene copolymer melts

Preparation of molecular dispersed polymer blend composed of polyethylene and poly(vinyl acetate) by in situ polymerization of vinyl acetate using supercritical carbon dioxide

“…The soaking time results in equilibrium in the monomer concentration between the interior and exterior of the PE substrate. The pressure significantly affects the solubility of substance in scCO 2 [23] and the solubility of scCO 2 in the PE substrate [24,25]. It is known that the solubility of the monomer in scCO 2 and that of scCO 2 in the PE substrate increase with the pressure of scCO 2 .…”

Analysis of equations of state for polymers

“…The experimental PvT data used in this work were taken from the literature [7,21,[28][29][30][31][32] as shown in Table 1. For each polymer, the available data were subdivided in two sets: one used for parameter estimation (DATA1) and other for validation (DATA2).…”

“…Numerous equations of state have been developed to describe the PvT (pressure-volume-temperature) behavior of polymers. In literature, there are several studies comparing the fitting accuracy of various models for PvT data of polymers [1][2][3][4][5][6][7] . These studies are focused mainly in the analysis of the fitting accuracy of the specific volume in the molten state, employing usually the method of least squares [2,3,6,[8][9][10][11][12][13][14][15][16][17][18][19][20] for the parameter estimation step.…”

A new molecular model for fluids

“…Inserting the expressions for ε 1,i of (19), s 1,i of (20), and substituting k 10 = exp(−ˇ g 10 ) withˇ= 1/kT we get…”

“…The hole theory still stimulates the interest of many investigators [17][18][19][20], and we present here a model in which we attempt to minimize difficulties found in previous models. The parabolic potential in the LJD cell model is used in a simplified analytical approximation to describe molecular interactions in the closepacked fluid state (CPF) of the system.…”