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Polymers of intrinsic microporosity (PIMs) substituted with methyl tetrazole

 
 
Affiliation:
National Research Council Canada
Language:
English
Type:
Article
Published in:
Polymer
Date:
2012
Pages :
4367-4372
NRCC #:
53101
NPArC #:
20597327
Keywords:
Microporosity; Membrane; Tetrazole
Group(s):
Energy, Mining and Environment; Énergie, mines et environnement
Abstract:
A polymer of intrinsic microporosity (PIM-1) containing nitrile groups was reacted by [2 + 3] cycloaddition reaction to give a polymer substituted with tetrazole groups (TZ-PIM), and then was further methylated to give a new PIM substituted with methyl tetrazole groups (MTZ-PIM). In contrast to TZ-PIMs, the MTZ-PIMs had distinctly improved solubility characteristics, enabling a more detailed investigation of the degree of conversion for the cycloaddition reaction and the structures of TZ-PIMs, which showed the presence of two kinds of tetrazole rings. Compared with PIM-1, the MTZ-PIM showed higher gas permselectivity with a corresponding decrease in gas permeability for pure gas pairs such as O₂/N₂ and CO₂/N₂, and for mixed gases, such as CO₂/N₂. Data for selectivity coupled with high gas permeability is close to the Robeson 2008 upper-bound performance limit for the O₂/N₂ and CO2/N2 pure gas pairs, and exceeds the upper-bound for the CO₂/N₂ mixed gas pair.
 
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