An, Heseong Lee, Albert S. Kammakakam, Irshad Hwang, Seung Sang Kim, Jeong-Hoon Lee, Jung-Hyun Lee, Jong Suk 2024-01-19T23:33:47Z 2024-01-19T23:33:47Z 2022-01-25 2018-01 0376-7388 https://pubs.kist.re.kr/handle/201004/121841 A new method for enhancing condensable gas-induced plasticization resistance of aromatic polyimides (PIs) as well as increasing the flux of gas penetrants with negligible selectivity loss was demonstrated via a so-called bromination/debromination-induced thermal crosslinking. Our newly developed crosslinking approach essentially loosened the polymeric chain packing of 6FDA-Durene PIs by forming ethylene crosslinking bonds, while retaining its rigid PI backbone. As the degree of crosslinking increased, the permeability increased with trivial selectivity loss. Notably, the 75% bromination/debromination-induced crosslinked PI membranes drastically improved CO2 and C3H6 permeabilities by as much as 157% and 172%, respectively, compared to those of the pristine-PI analogs due to the debromination-induced free volume enhancement, while maintaining good selectivity due to the crosslinked ethylene bridges. As a result, outstanding separation performances for CO2/N-2, CO2/CH4 and C3H6/C3H8 gas pairs have been obtained, and most importantly, a high tolerance to CO2-or C3H6-induced plasticization was observed up to CO2 or C3H6 pressure of 24 and 10 atm, respectively. Our current crosslinking approach can be extended to industrially attractive hollow fiber forms of various aromatic PIs for high plasticization resistance as well as high flux. English ELSEVIER SCIENCE BV Bromination/debromination-induced thermal crosslinking of 6FDA-Durene for aggressive gas separations Article 10.1016/j.memsci.2017.09.083 1 JOURNAL OF MEMBRANE SCIENCE, v.545, pp.358 - 366 JOURNAL OF MEMBRANE SCIENCE 545 358 366 N scie scopus 000413270200041 2-s2.0-85030854473 Engineering, Chemical Polymer Science Engineering Polymer Science Article CO2 PLASTICIZATION RESISTANCE HOLLOW-FIBER MEMBRANES MIXED MATRIX MEMBRANES POLYIMIDE MEMBRANES TRANSPORT PROPERTIES PROPYLENE/PROPANE SEPARATIONS GLASSY-POLYMERS PURIFICATION PERMEATION PERMSELECTIVITY Bromination/debromination Thermal crosslinking 6FDA-Durene Plasticization resistance High flux