Bromination/debromination-induced thermal crosslinking of 6FDA-Durene for aggressive gas separations

Heseong An, Albert S. Lee, Irshad Kammakakam, Seung Sang Hwang, Jeong Hoon Kim, Jung Hyun Lee, Jong Suk Lee

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)358-366
Number of pages9
JournalJournal of Membrane Science
Publication statusPublished - 2018


  • 6FDA-Durene
  • Bromination/debromination
  • High flux
  • Plasticization resistance
  • Thermal crosslinking

ASJC Scopus subject areas

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation


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