Please use this identifier to cite or link to this item: https://doi.org/10.1039/c0ee00278j
Title: Grafting thermally labile molecules on cross-linkable polyimide to design membrane materials for natural gas purification and CO2 capture
Authors: Xiao, Y. 
Chung, T.-S. 
Issue Date: Jan-2011
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
URI: http://scholarbank.nus.edu.sg/handle/10635/89023
ISSN: 17545692
DOI: 10.1039/c0ee00278j
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