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|Title:||Grafting thermally labile molecules on cross-linkable polyimide to design membrane materials for natural gas purification and CO2 capture|
|Authors:||Xiao, Y. |
|Citation:||Xiao, Y., Chung, T.-S. (2011-01). Grafting thermally labile molecules on cross-linkable polyimide to design membrane materials for natural gas purification and CO2 capture. Energy and Environmental Science 4 (1) : 201-208. ScholarBank@NUS Repository. https://doi.org/10.1039/c0ee00278j|
|Abstract:||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 °C produces polyimide membranes with the best CO2 permeability of 4016 Barrer with reasonable gas pair selectivity. © 2011 The Royal Society of Chemistry.|
|Source Title:||Energy and Environmental Science|
|Appears in Collections:||Staff Publications|
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