Thermodynamics of Polymer Melts Swollen with Supercritical Gases

Abstract

We report gas solubilities in molten polymers for two systems: the solubility of carbon dioxide in poly(dimethylsiloxane) and the solubility of 1,1-difluoroethane in polystyrene are measured in the range of temperatures and pressures where the gas is supercritical. The solubility data are correlated by two lattice-theory-based equations of state, namely, the Sanchez-Lacombe and Panayiotou-Vera equations of state, which employ a single adjustable binary interaction parameter. Both equations of state provide satisfactory descriptions of the solubility data when the binary interaction parameter is allowed to depend on temperature. The utility of the mixture equations of state is illustrated by predictions of swollen volume, isothermal compressibility, and thermal expansion coefficient for the mixtures over the range of data.

Development of Continuous Solvent Extraction Processes for Coal Derived Carbon Products

“…Reviewing the literature for polymer processing and macromolecules, the Sanchez-Lacombe (S-L), and Panayiotou-Vera (P-V) equations yield fairly accurate predictions for pure polymer melt and diluted melt polymer solutions. 95 , 96 , 97 , 98 , 99 Both use equilibrium chemical potentials in the melt and gas phases to correlate solubility to the pure phase through a binary interaction parameter. The models and modeling techniques may possibly be extended to pitch as well.…”

Development of Continuous Solvent Extraction Processes for Coal Derived Carbon Products

“…Reviewing the literature for polymer processing and macromolecules, the Sanchez-Lacombe (S-L), and Panayiotou-Vera (P-V) equations yield fairly accurate predictions for pure polymer melt and diluted melt polymer solutions. 83,84,85,86,87 Both use equilibrium chemical potentials in the melt and gas phases to correlate solubility to the pure phase through a binary interaction parameter. The models and modeling techniques may possibly be extended to pitch as well.…”

Solubility of carbon dioxide in polyethylene/titanium dioxide composite under high pressure and temperature

“…That is, the last equation required for solubility calculation is the equation of phase equilibrium, which equates the chemical potentials of gas in the two phases 7,8,14 :…”

“…7 Most of the polymers for which solubility of CO 2 has been reported were homogeneous. [2][3][4][5][6][7][8] There are few data available for polymer composites and blends. In this paper, using the MSB, the solubility of CO 2 in the polyethylene/titanium dioxide composites is measured at temperature in the range from 423 to 473 K and pressure up to 15 MPa.…”