Published:
September 14, 2006
Freeman's Group - 2006 American Chemical Society (ACS) Annual Conference in San Francisco - Preprints.
- Bryan McCloskey, "Amphiphilic Graft Copolymers as Antifouling Coatings for Water Purification Membranes"
- Hao Ju, "Synthesis and Characterization of Surface Coated Ultrafiltration Membranes to Enhance Oil/Water Fouling Resistance"
- Ho Bum Park, "Water and Salt Transport Behavior through Hydrophilic-Hydrophobic Copolymer Membranes and Their Relations to Reverse Osmosis Membrane Performance"
- Roy Raharjo, "A Fundamental Study of Mixture Permeability, Solubility, and Diffusivity in Vapor Selective Polymers"
- Scott Kelman, "Enhancing the Chemical Resistance of High Fractional Free Volume Vapor-Selective Polymers"
- Xiaoyan Wang, "Effect of Free Volume on Gas Sorption in Polymeric Membranes". Co-authors Xiao-Yan Wang, Benny D. Freeman, Isaac C. Sanchez, and Anita J. Hill (CSIRO-CMIT, Australia)
- Abstract: Poly(1-trimethylsilyl-1-propyne) (PTMSP), a solubility selective membrane, has the potential to be used in the natural gas separation. PTMSP ages rapidly as evidenced by the density increase with time; then the free volume decreases with time. Cavity size (free volume) distributions of PTMSP are calculated at different densities using an energetic based cavity-sizing algorithm. Free volume of PTMSP decreases with increasing densities. We also simulate solubility of CO2 and CH4 in PTMSP at different densities. Solubility shows no significant change as the density increases. This result is in contradictory with the prediction from the scale particle theory, but it is in agreement with experimental observation.
- Key words: solubility, free volume, molecular simulation, scale particle theory