Gas separation performance of 6FDA-based polyimides with different chemical structures

Side-chain engineering of ladder-structured polysilsesquioxane membranes for gas separations

“…The separation performance of LPSQ membranes shows a typical trade-off correlation between permeability and selectivity like other conventional glassy polymeric membranes (See Fig. 4) [6]. As the permeability increases, the selectivity decreases and vice versa.…”

“…For instance, hexafluorodianhydride (6FDA)-based polyimides, well known for their superior gas separation performance and tunable chemical backbone structure, have been intensively investigated [4,5]. Qiu et al, provided valuable insight into the relationship between chemical structures and gas separation properties on 6FDA-based polyimides [6]. Another well-known polymer, poly[1-(trimethylsily)-1-propyne] (PTMSP), has been sought out as one of the most permeable glassy polymers [7], due to its rigid acetylene backbone and bulky alkyl group.…”

Physical aging in carbon molecular sieve membranes

“…Clearly, properties of polymeric membranes may be affected by contaminants or penetrant induced plasticization [37][38][39][40], etc. This fact notwithstanding, ''aging'' in polymeric membranes generally refers to physical aging in non-equilibrium glassy polymers undergoing physical rearrangements to approach an equilibrium state.…”

Plasticization and Swelling in Polymeric Membranes in CO2 Removal from Natural Gas

“…Methods commonly used for CO 2 removal from CH 4 include absorption, adsorption, cryogenic distillation, and membrane technology [10]. All these methods are relatively complex and require high costs as compared to membrane technology [2,3,[10][11][12].…”