期刊
JOURNAL OF MEMBRANE SCIENCE
卷 378, 期 1-2, 页码 541-550出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2011.05.048
关键词
PAI-PES; Defect-free dual-layer hollow fiber membrane; Ultrathin dense-selective layer; Positron annihilation spectroscopy (PAS); Doppler broadening energy spectra (DBES)
资金
- Singapore National Research Foundation (NRF) [R-279-000-261-281]
Defect-free polymeric dual-layer hollow fiber membranes consisting of an ultrathin dense-selective polyamide imide (PAI) layer and a polyethersulfone (PES) supporting layer have been successfully fabricated in this study for gas separation application. It is observed that a lower outer-layer dope flow rate does not necessarily result in the formation of an ultrathin dense-selective layer upon the PES supporting layer. An optimization in the velocity between the inner-layer and the outer-layer dopes at the exit of the spinneret is essential to minimize additional stresses and defect formation in the outer functional layer. The best gas separation performance of the PAL-PES dual-layer hollow fibers fabricated in this study has an O(2)/N(2) selectivity of 7.73 with a dense-selective layer thickness of 63 nm. Positron annihilation spectroscopy (PAS) has been used for the first time to explore the morphology and predict the gas separation performance of PAI-PES based dual-layer hollow fiber membranes. Doppler broadening energy spectra (DBES) from PAS accurately estimate the outer-layer thickness and demonstrate the existence of the multilayered structure of the dual-layer hollow fiber membranes. Besides, the PAS fitted data reveal that the fiber spun under the optimal condition has the densest selective layer, which agrees well with the highest gas-pair selectivity observed under this condition. (C) 2011 Elsevier ay. All rights reserved.
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