Preparation and gas permeation of crown ether-containing co-polyimide with enhanced CO2 selectivity

Introducing hydrophilic ultra-thin ZIF-L into mixed matrix membranes for CO2/CH4 separation

“…[2][3][4] There are ways to improve the efficiency of the separations of polymer based membranes to overcome this trade-off effect. The current methods are new polymer design, 5,6 polymer blending 7 and particle lling. [8][9][10] Among them, the introduction of inorganic llers into polymers to generate MMMs has attracted signicant interest from researchers, as the method is simple and effective.…”

Free volume characteristics of 2,2‐bistrifluoromethyl‐4,5‐difluoro‐1,3‐dioxole‐co‐tetrafluoroethylene copolymers: Effect of composition and molecular weight

“…The above procedures were repeated if the density was more than 10% lower than the experimental density. Finally, the balancing process was performed with a 400 ps MD running in the NVT ensemble 23,24 . The time step was set as 1 fs in the MD simulations and other parameters were obtained from previous literatures 23–25 .…”

“…Finally, the balancing process was performed with a 400 ps MD running in the NVT ensemble 23,24 . The time step was set as 1 fs in the MD simulations and other parameters were obtained from previous literatures 23–25 . FFV MDS values of simulate copolymer models were estimated as below: where V is the simulation cell volume, and V w is the van der Waals volume which is calculated directly by Atom Volumes and Surfaces tool of the model software, 26 instead of the group contribution method 24,27 …”

Synthesis and CO2 separation of novel polyurethane membranes containing urea linkages

“…Polysulfone, polycarbonates, polyimide, Pebax, and polyurethane (PU) are commonly used in polymer‐membrane‐based gas separation . PU has been widely used in gas separation because of its good thermal stability and desirable permeation properties.…”