期刊
JOURNAL OF MEMBRANE SCIENCE
卷 294, 期 1-2, 页码 178-185出版社
ELSEVIER
DOI: 10.1016/j.memsci.2007.02.035
关键词
carbon nanotubes; nanocomposite membrane; gas separation; brominated poly(phenylene oxide)
The mechanical strength of polymeric membranes is one of the limitations in their applications. Carbon nanotubes (CNTs) are very effective in reinforcing polymeric materials, but it is unknown whether they degrade the membranes' gas separation performance. Using brominated poly(2,6diphenyl-1,4-phenylene oxide) (BPPOdp) as an example, we show that pristine single-wall CNTs (SWNTs) and multi-wall CNTs (MWNTs) formed polymeric nanocomposite membranes with BPPOdp. The composite membranes had an increased CO, permeability but a similar CO2/N-2 selectivity compared to the correspondin g pure-polymer membrane. The CO2 permeability increased with increasing the CNT content and reached a maximum of 155 Barter at 9 wt% of SWNTs, or 148 Barter at 5 wt% of MWNTs. The CO2/N-2 separation performance was insensitive to the MWNT diameter or length. Carboxylic acid-functionalized SWNTs (COOH-SWNTs) dispersed more uniformly in BPPOdp, and neither increased the gas permeability nor deteriorated the gas separation performance. Thus, it is feasible to add CNTs to polymeric membranes for improved mechanical strength without deteriorating the gas separation performance of the membranes. The pristine CNT-enhanced gas permeability was attributed to the formed nanogaps surrounding the CNTs. (C) 2007 Elsevier B.V. All rights reserved.
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