Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 4, Issue 1, Pages 201-208Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0ee00278j
Keywords
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Funding
- Singapore National Research Foundation (NRF) [R-279-000-261-281]
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A novel strategy to design molecularly the cavity size and free volume of flexible polyimide materials via thermal treatment of rigid and cross-linkable polyimides grafted with thermal liable side beta-cyclodextrin (CD) molecules is demonstrated in this study. The spaces occupied by the labile groups may become microvoids after low-temperature thermal degradation while the rigid polyimide backbone prevails. The thermal induced cross-linking reaction among polyimide chains may create ultra-fine micro-pores that integrally connect with microvoids. As a result, the thermally cured membranes fabricated from dense polyimide precursors show gas separation performance surpassing the trade-off lines, with tough and flexible mechanical properties. Thermal annealing at 425 degrees C produces polyimide membranes with the best CO2 permeability of 4016 Barrer with reasonable gas pair selectivity.
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