TY - JOUR
T1 - Bromination/debromination-induced thermal crosslinking of 6FDA-Durene for aggressive gas separations
AU - An, Heseong
AU - Lee, Albert S.
AU - Kammakakam, Irshad
AU - Sang Hwang, Seung
AU - Kim, Jeong Hoon
AU - Lee, Jung Hyun
AU - Suk Lee, Jong
N1 - Funding Information:
This research was supported by R&D Convergence Program of MSIP ( Ministry of Science, ICT and Future Planning ) and NST ( National Research Council of Science & Technology ) ( CRC-14-1-KRICT ), the Project No KK1601-F00 (Membrane Technology for Production of High-Purity Carbon Resources from By-product Gases) of Korea Research Institute of Chemical Technology (KRICT), and Sogang University Research Fund.
Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2018
Y1 - 2018
N2 - 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/N2, 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.
AB - 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/N2, 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.
KW - 6FDA-Durene
KW - Bromination/debromination
KW - High flux
KW - Plasticization resistance
KW - Thermal crosslinking
UR - http://www.scopus.com/inward/record.url?scp=85030854473&partnerID=8YFLogxK
U2 - 10.1016/j.memsci.2017.09.083
DO - 10.1016/j.memsci.2017.09.083
M3 - Article
AN - SCOPUS:85030854473
SN - 0376-7388
VL - 545
SP - 358
EP - 366
JO - Jornal of Membrane Science
JF - Jornal of Membrane Science
ER -