Portal de Periódicos da CAPES

Solubility of carbon dioxide, methane, and propane in silicone polymers. Effect of polymer backbone chains

1993; Wiley; Volume: 31; Issue: 3 Linguagem: Inglês

10.1002/polb.1993.090310309

1099-0488

V. M. Shah, Barry J. Hardy, S. A. Stern,

Membrane Separation and Gas Transport

Abstract The solubility of carbon dioxide, methane, and propane in poly(dimethyl silmethylene) [(CH 3 ) 2 SiCH 2 ] x and poly(tetramethyl silhexylene siloxane) [(CH 3 ) 2 Si (CH 2 ) 6 Si (CH 3 ) 2 O] x was measured in the temperature range from 10.0 to 55.0°C and at elevated pressures. The present results are compared with similar measurements made with other silicone polymers. At a given temperature and pressure, the solubility of the above three gases is highest in poly(dimethyl siloxane) (Me 2 SiO) x . The gas solubility is decreased by either backbone‐chain or side‐chain substitutions of functional groups in (Me 2 SiO) x which increase the stiffness of the polymer chains and decrease the specific or fractional free volume of the polymers. It is conjectured that a decrease in the free volume of silicone polymers has a greater effect in decreasing the gas solubility than differences in gas/polymer interactions [with the exception of specific interactions (e.g., between CO 2 and polar groups in the polymer)]. © 1993 John Wiley & Sons, Inc.