1. Enhancement of CO2Affinity in a Polymerof Intrinsic Microporosity by Amine Modification.
- Author
-
Mason, Christopher R., Maynard-Atem, Louise, Heard, Kane W.J., Satilmis, Bekir, Budd, Peter M., Friess, Karel, Lanc̆, Marek, Bernardo, Paola, Clarizia, Gabriele, and Jansen, Johannes C.
- Subjects
- *
POLYMERS , *CARBON dioxide adsorption , *MICROPOROSITY , *AMINES , *BORANES , *PERMEABILITY , *DIFFUSION , *HYDROGEN bonding - Abstract
Nitrile groups in the polymer ofintrinsic microporosity PIM-1were reduced to primary amines using borane complexes. In adsorptionexperiments, the novel amine–PIM-1 showed higher CO2uptake and higher CO2/N2sorption selectivitythan the parent polymer, with very evident dual-mode sorption behavior.In gas permeation with six light gases, the individual contributionsof solubility and diffusion to the overall permeability was determinedvia time-lag analysis. The high CO2affinity drasticallyrestricts diffusion at low pressures and lowers CO2permeabilitycompared to the parent PIM-1. Furthermore, the size-sieving propertiesof the polymer are increased, which can be attributed to a higherstiffness of the system arising from hydrogen bonding of the aminegroups. Thus, for the H2/CO2gas pair, whereasPIM-1 favors CO2, amine–PIM-1 shows permselectivitytoward H2, breaking the Robeson 2008 upper bound. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF