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dc.contributor.authorYang, Yanqinen_US
dc.contributor.authorGoh, Kunlien_US
dc.contributor.authorWeerachanchai, Piyaraten_US
dc.contributor.authorBae, Tae-Hyunen_US
dc.identifier.citationYang, Y., Goh, K., Weerachanchai, P. & Bae, T. (2018). 3D covalent organic framework for morphologically induced high-performance membranes with strong resistance toward physical aging. Journal of Membrane Science, 574, 235-242.
dc.description.abstractThe physicochemical properties of filler materials are critical considerations influencing the separation performances of mixed-matrix membranes (MMMs). Herein, a three-dimensional covalent organic framework (3D-COF) with a secondary amine-containing backbone was designed to offer large surface area, high porosity and good affinity toward CO2 molecules. Membranes prepared from this 3D-COF filler and a 6FDA-DAM polyimide matrix demonstrated a more significant enhancement in the CO2/CH4 separation performance, which was unattainable by its 2D-COF analogue. Specifically, with 10 and 15 wt% loadings of 3D-COF fillers, the MMMs membranes were able to enhance the CO2 permeability by ~57% and 140%, respectively, at a comparable, if not better, CO2/CH4 selectivity than the unfilled membrane. Furthermore, glassy polymers of high fractional free volume such as 6FDA-DAM tend to suffer from a ubiquitous loss in performance over time due to a physical aging effect. In this regard, the 3D-COF was effective in slowing down the aging process by capitalizing on its high surface area and amine functional groups to immobilize and rigidify the 6FDA-DAM polymer chains, preventing the collapse of the free volume. This allows 97% of the initial membrane performances to be effectively retained after 240 days of aging. Our findings suggest the potential of morphologically-tuned COFs to develop high-performance MMMs with strong practical relevance.en_US
dc.description.sponsorshipMinistry of Education (MOE)en_US
dc.relation.ispartofJournal of Membrane Scienceen_US
dc.rights© 2018 Elsevier B.V. All rights reserved.en_US
dc.subjectEngineering::Chemical engineeringen_US
dc.title3D covalent organic framework for morphologically induced high-performance membranes with strong resistance toward physical agingen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Chemical and Biomedical Engineeringen_US
dc.contributor.researchSingapore Membrane Technology Centreen_US
dc.contributor.researchNanyang Environment and Water Research Instituteen_US
dc.subject.keywords3D Covalent Organic Frameworken_US
dc.subject.keywordsMixed-matrix Membraneen_US
dc.subject.keywordsCO₂ Captureen_US
dc.description.acknowledgementThe authors would like to thank the Academic Research Fund Tier-1 (Project reference number: RG118/16 and RG8/17) from the Ministry of Education, Singapore, for the financial support.en_US
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