A defect-free membrane with a very high gas permeance is greatly attractive to both academia and industry. Thin film composite (TFC) membranes are promising candidates. However, it is always challenging to have a reproducible and up-scalable method to fulfill the needs. Herein, we report a novel and straightforward strategy to fabricate a high-performance hollow fiber composite membrane using a crosslinked polydimethylsiloxane (PDMS) with a high inherent viscosity obtained from a novel post-crosslinking method. The evolution of inherent viscosity with various cross-linking conditions and substrate morphology from different spinning conditions have been investigated. The resultant defect-free composite membrane shows excellent O2 and CO2 permeances higher than 1000 and 5000 GPU, respectively; while the corresponding selectivities of O2/N2 and CO2/N2 are about 2 and 11, respectively. The newly developed methods may provide useful insights to fabricate next-generation high-performance composite membranes for gas separation.
Bibliographical noteFunding Information:
This research grant is supported by the National Research Foundation Singapore with the project entitled, “Membranes to remove air pollutants and excess humidity for better indoor air quality and energy saving” (Grant number: R-279-000-453-279). Special thanks to Mr. Baiwang Zhao, Ms. Manqing Li, and Ms. Liang-Yi Wang for their supports and help.
© 2017 Elsevier B.V.
- Composite hollow fiber membrane
- Crosslinked PDMS
- Flue gas
- Gas separations
- Oxygen enrichment
ASJC Scopus subject areas
- General Materials Science
- Physical and Theoretical Chemistry
- Filtration and Separation