Rigid and microporous polymers for gas separation membranes

Polycarbonate/Polypropylene-Graft-Maleic Anhydride and Nano-Zeolite-Based Nanocomposite Membrane: Mechanical and Gas Separation Performance

“…Increasing zeolite content may act as adsorbing component in the membrane [12][13][14]. Moreover, high potential polycarbonate/zeolite mixed matrix membrane has also been developed [15]. The membrane structure and performance have been influenced by the particle size and zeolite content.…”

Recent developments in membranes for efficient hydrogen purification

“…In addition to conventional glassy polymers for gas separation introduced above, various advanced microporous polymers such as conjugated microporous polymers (CMPs), hypercrosslinked polymers (HCPs) and covalent organic frameworks (COFs), TR polymers and PIMs，have received much attention in gas separation over the past years [149,150].…”

“…Thus TR polymers have been widely used for gas separation membranes for valuable gas pairs in recent years. A stiff or rigid backbone not only could generate the molecular windows of controlled size to increase diffusivity selectivity but also could disrupt the chain packing to improve gas permeability for microporous polymers, hence great efforts have been made to enhance the rigidity of entire microporous polymer structure for separation performance improvement [150].…”

“…Owing to the decomposition of β-cyclodextrin during post-thermal treatment, the TR polymer had a very high fraction free volume, and consequently the CO 2 permeability of this TR polymer-based membrane could reach about 8000 barrer at 308 K. So far, many studies have proposed that TR polymers derived from various polyimides displayed excellent gas permeability and favorable selectivity for H 2 /CH 4 , H 2 /N 2 and CO 2 /CH 4 mixed gas[150]. In these binary mixtures, the difference of gas molecules in kinetic diameter is relatively obvious, while the size difference is only 0.41 Å between H 2 and CO 2 molecules.…”

Fabrication of thermally rearranged (TR) polybenzoxazole hollow fiber membranes with superior CO2/N2 separation performance

“…Despite the aforementioned benefits, the low permeation flux of most of the conventional polymeric membranes impedes the further advance of the membrane technology in the area of flue gas carbon capture, where a huge volume of flue gas needs to be processed at low pressure. To overcome the permeability limitation of most polymeric membranes, thermally rearranged (TR) polymer membranes derived from hydroxyl containing polyimide precursors were developed in our group, which offered two orders of magnitude higher permeability [3,4] than other conventional polymeric membranes, whilst providing moderate selectivity. Such a substantial improvement in permeability was mainly attributed to the high fractional free volume (FFV) of the TR polymer membranes.…”