(672a) CO2-Philic Polymer Membranes for High Flux CO2 Separation

Authors: 
Saito, T., Oak Ridge National Laboratory
Hong, T., University of Tennessee
Cao, P., Oak Ridge National Laboratory
Li, B., Oak Ridge National Laboratory
Mahurin, S., Oak Ridge National Laboratory
Jiang, D. E., UC Riverside
Vogiatzis, K., University of Minnesota
Mays, J. W., Oak Ridge National Laboratory
Long, B., University of Tennessee
Sokolov, A., Oak Ridge National Laboratory
The vast majority of the world’s energy is presently derived from the burning of fossil fuels, which releases vast quantities of carbon dioxide (CO2) into the environment and results in undesirable climate change. Practical and cost efficient methods of CO2 separation and capture would thus solve one of the most challenging problems today. This presentation summarizes our effort on the development of novel polymer membranes functionalized with CO2-philic groups for high flux CO2 separation. Our strategy focuses on tuning solubility selectivity in addition to diffusivity selectivity for achieving high permeability membranes combined with good selectivity. Various synthetic techniques including ROMP and post functionalization were used and the careful design permits to prepare well-defined novel high permeable polymers containing CO2-philic groups. This study demonstrated the addition of CO2-philic groups (e.g. amidoxime and PEO) significantly increased the solubility selectivity of CO2 over N2. The membrane performance is also highly dependent on the balance of gas/functional group interaction, intra/inter- molecular interaction (H-bonding etc.) of membrane, packing, and polymer dynamics. Tuning the balance of the interaction enables to achieve the CO2 separation performance over the Robeson upper bound, e.g. CO2 permeability 3000-8000 Barrer and CO2/N2 selectivity 18-20. The structure-property relationships especially on CO2 uptake, CO2 and N2 permeability, CO2/N2 selectivity to the polymer structure will be discussed.