Hydrocarbon and fluorocarbon solubility and dilation in poly(dimethylsiloxane): Comparison of experimental data with predictions of the Sanchez-Lacombe equation of state

Partial Molar Volumes and Thermal Expansion Coefficients as an Explanation for Co-Solvent Effect of Penetrants in Multicomponent Polymer Mixtures

“…[ 7,13 ] Subsequently, the PMV of each species in the mixture, defi ned by Equation ( 6) , can be calculated [ 3,9 ] …”

“…PDMS is also considered as suitable for the removal of higher hydrocarbons from natural gas. [ 7,17,36 ] Among such mixtures, the methane/n-butane (CH 4 /n-C4) mixture can be considered as a model mixture, since natural gas contains methane as the main product, whereas n-butane is considered as a marker molecule for higher hydrocarbons. [ 17 ] Recently, Sanders and co-workers, [ 17 ] experimentally measured the solubility and swelling of PDMS caused by pure CH 4 , pure n-C4 and various mixtures of CH 4 /n-C4 in the temperature range of −20-50 °C.…”

“…[ 1,[3][4][5][6][7][8][9][10][11][12][13] The PMVs of various gases (or penetrants) in binary gas(1)/polymer(2) mixtures have been estimated for different polymers using experimental dilation, sorption or densimetry data, and hyper-parallel tempering osmotic ensemble techniques. [ 1,2,[4][5][6][7][10][11][12][13][14][15][16] Ternary mixtures (i.e., gas(1)/gas(2)/polymer (3)) represent a simple case of realistic multicomponent systems and, despite of the fact that multicomponent gases/polymer mixtures are very common in polymerization reactors and in the downstream processing units, only few studies have been conducted to estimate or analyze the PMV of the individual species present in such systems. For example, the only known work related to the PMVs of two simultaneously sorbing gases in a single polymer phase was done by Freeman and co-workers, [ 17 ] in which the authors experimentally measured the solubility of pure methane (CH 4 ), pure n-butane (n-C 4 H 10 ), and their mixtures in poly(dimethylsiloxane) (PDMS) at different temperatures and pressures.…”

Sorption properties of hydrogen-selective PDMS/zeolite 4A mixed matrix membrane

“…The present study explores the estimating sorption of gases in membranes comprised of porous fillers within rubbery polymer matrixes using a new semi-empirical correlation. The solubility of gases in membranes comprised of nonporous fumed silica particles as filler within glassy polymers was previously presented by Angelis and Sarti [32] based on NELF model. This model relates gas solubility in the composite membranes to the variations induced by addition of the fillers on the polymers density and swellability.…”

Estimation of solvent diffusion coefficient in amorphous polymers using the Sanchez–Lacombe equation-of-state

“…They are the cell theory, lattice-fluid theory and hole theory. The EOS proposed by Lacombe (1976, 1977) is a representation of the lattice-fluid theory, and has been widely used to describe polymer-solvent phase behavior (Gauter and Heidemann, 2001), thermodynamic properties of polymer-gas systems (De Angelis et al, 1999;Liu et al, 2005;Prabhakar et al, 2005), solid-supercritical fluid phase equilibrium (Nicolas et al, 2005) and so on. Because EOSs can describe the variation of polymer volume with temperature and pressure, and the free volume is closely related to the space within polymer matrixes, which can be used in solvent diffusion, we hope to find the inherent relationship between molecular thermodynamic and transport properties, and introduce an EOS into the mathematical model to estimate diffusivities in polymer solutions.…”