Intermediate thermal manipulation of polymers of intrinsic microporous (PIMs) membranes for gas separations

Abstract

The high fractional free volume (FFV) endowed polymers of intrinsic microporosity (PIMs) with high gas permeability but low selectivity. Herein, an intermediate temperature range was deliberately utilized to tune PIM‐1 membrane microstructure in nitrogen atmosphere to enhance gas separation performance. During intermediate thermal manipulation, the synergistic effects of thermal‐induced cross‐linking and decomposition on PIM‐1 membranes have optimized the micropores for significantly increasing membrane molecular‐sieving ability with the boosted selectivity of 350 (H2/N2), 1,472 (H2/CH4), 3,774 (H2/C3H8), and 197 (CO2/CH4) respectively, with the H2 permeability of 234 Barrer, correspondingly, surpassing the “Robeson's Upper Bound”. The facile strategy simultaneously utilizing the thermal‐induced cross‐linking and decomposition, might provide a new platform to develop the high‐performance membranes for highly‐efficient hydrogen purification and CO2 separations.

Modification strategies to improve the membrane hemocompatibility in extracorporeal membrane oxygenator (ECMO)

“…Although PDMS-based materials are the most widely utilized materials [36] in the preparation of ECMO membranes, they possess a series of major shortcomings. For example, the hydrophobic properties of these membranes lead to serious protein adhesion and thrombosis, so researchers will increase biocompatibility by changing the physico-chemical performance of the membrane surface, such as surface hydrophilic modification, which will have a certain influence on the membrane performance [37][38][39][40].…”

Fabrication of zeolitic imidazolate frameworks based mixed matrix membranes and mass transfer properties of C4H6 and N2 in membrane separation

“…However, the selection of fillers and polymers is limited to form a defect-free interface on the basis of these factors. 12 Polydimethylsiloxane (PDMS), 13 polyether block amide, 14 matrimid, 15 polymers of intrinsic micro porosity, 16 polyethylene oxide, 17 polyvinyl alcohol, 18 and polyimides 19 are polymers that have been commonly used in the fabrication of MMMs, while, zeolites, 20 carbon nanotubes, 21 graphene oxide, 22 and metal-organic frameworks (MOFs), 23,24 are the most extensively used nano porous materials as fillers in MMMs.…”

Oxygen barrier property of synthesized polyacrylate coatings containing inter‐chain cross‐linking architecture on PET film

“…28,29 The pore volume rearranged without energy support will cause the diffusion of micromolecule in polymer. 30,31 But now, a growing number of researchers convince that comparing with the free volume, the chain activity plays a decisive role in diffusion. 32 So foundation on 00 free volume model, 00 the percolation theory is proposed.…”

“…This model considers that the free volume is consist of clearances and pores 28,29 . The pore volume rearranged without energy support will cause the diffusion of micromolecule in polymer 30,31 . But now, a growing number of researchers convince that comparing with the free volume, the chain activity plays a decisive role in diffusion 32 .…”