High-Performance Carboxylated Polymers of Intrinsic Microporosity (PIMs) with Tunable Gas Transport Properties†
By Naiying Du, G. Robertson, Jingshe Song, I. Pinnau, M. Guiver. 2009
280 citations recorded by the source corpus.
Carboxylated polymers of intrinsic microporosity (carboxylated PIMs) are reported as potential high-performance materials for membrane-based gas separation. Carboxylated PIM membranes were prepared by in situ hydrolysis of the nitrile groups of PIM-1 films. Structural characterization was performed by Fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance (1H NMR). The degree of hydrolysis was determined by carbon elemental analysis. The thermal properties were evaluated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Compared with PIM-1, carboxylated PIMs with different degrees of hydrolysis have similar thermal and mechanical properties but show higher selectivity for gas pairs such as O2/N2, CO2/N2, He/N2, and H2/N2 with a corresponding decrease in permeability. Selectivity coupled to high permeability combines to exceed the Robeson upper-bound line for the O2/N2 gas pair. This work demonstrates that significant improvements in gas separati...
Subfields: Mechanical Engineering, Mechanics of Materials, Water Science and Technology
View Paper: https://www.semanticscholar.org/paper/18596301240449f67be1abd3ad5ac07d07e6a398
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Citations in the corpus
- Polymers of Intrinsic Microporosity (2009, methodology): “Modifications to the nitrile substituents of PIM-1 to introduce carboxylic acid, thioamide, and tetrazole groups all significantly reduce the apparent surface area presumably due to the hydrogen bonding properties of these groups increasing polymer cohesion and improving packing [69, 71, 73].”