Pure- and Mixed-Gas CO2/CH4 Separation Properties of PIM-1 and an Amidoxime-Functionalized PIM-1

摘要

The prototypical solution-processable polymer of intrinsic microporosity, PIM-1, and derivatives thereof offer combinations of permeability and selectivity that make them candidate materials for membrane-based gas separations. Paramount to the design and evaluation of PIMs for economical natural gas sweetening is a high and stable CO2/CH4 selectivity under realistic, mixed-gas conditions. Moreover, post-polymerization modification is a convenient means of introducing CO2-philic functionalities - i.e, nitrogen containing heterocycles or hydroxyl moieties - onto the main chain that may improve Lewis acid-Lewis base interactions with CO2. Only a few reports provide successful post-polymerization reactions using hydrophilic functionalities at the nitriles of PIM-1 because it often yields intractable products.