Abstract
Synergistic effect of PAF-1 incorporation and photo-oxidation on improving membrane gas separation performance with both high permeability and selectivity.
Highlights
Due to its high energy efficiency and low instrument footprint area compared with traditional phase-change separation methodologies, membrane technology is garnering increased attention for gas separation
We examined high-resolution N 1s spectra (Fig. S8†) of the samples to determine what impact, if any, UV-treatment had on the nitrile groups of the Polymers of Intrinsic Microporosity (PIMs)-1 membrane, as suggested by the results from Fourier-transform infrared spectroscopy (FT-IR) (Fig. 6)
The incorporation of PAF-1 contributed to the largely enhanced PIM-1 membrane permeability, especially for such a small kinetic diameter gas as H2, thanks to the extra highly permeable gas transport channels provided by PAF1
Summary
Due to its high energy efficiency and low instrument footprint area compared with traditional phase-change separation methodologies, membrane technology is garnering increased attention for gas separation. The current market-dominated membranes for industrial gas separation are mainly traditional glassy polymers, such as polyimides (PI), polysulfones (PSF), and cellulose acetate (CA). Paper efforts include polymer structure design (e.g., introducing Troger's Base (TB)[12–16] or triptycene moieties17,18); chemical[19–21] or thermal crosslinking;[22] UV crosslinking/oxidation;[23–29] and adding nanoparticles into the polymer matrix to form Mixed Matrix Membranes (MMMs).[30–34] Amongst these methods, crosslinking and UV oxidation are most effective at improving membrane selectivity, but with dramatic permeability loss.[29]. Our recent study revealed that PAF-1 works for conventional low FFV polyimide membrane.[46] Despite these remarkable achievements, industrial applications will require further improvement to their relatively moderate selectivity
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